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Dunst, A., &; Hartel, R. (2021). Computing Literary Surplus Value: Alan Moore and the Density of the Comic Book as Graphic Novel. Anglia, 139(1), 195–223.https://doi.org/10.1515/ang-2021-0010 

Böttcher, S., Hartel, R., &; Peeters, S. (2020). QSGG: query simulation in grammar-compressed graphs. In Proceedings of The International Workshop on Semantic Big Data.https://doi.org/10.1145/3391274.3393638 

Böttcher, S., Hartel, R., &; Peeters, S. (2020). Pattern Search in Grammar-Compressed Graphs. In 2020 Data Compression Conference (DCC) (Poster).https://doi.org/10.1109/dcc47342.2020.00054 

Hartel, R., &; Dunst, A. (2019). How Good Is Good Enough? Establishing Quality Thresholds for the Automatic Text Analysis of Retro-Digitized Comics. In International Conference on Multimedia Modeling, MMM (pp. 662–671). Thessaloniki, Greece: Springer.https://doi.org/10.1007/978-3-030-05716-9_59 

Dunst, A., &; Hartel, R. (2019). Multimodale Stilometrie: Herausforderungen und Potenzial kombinatorischer Bild- und Textanalysen am Beispiel Comics. In DHd Konferenz 2019, multimedial und multimodal.

Dunst, A., &; Hartel, R. (2019). Quantifying Complexity in Multimodal Media: AlanMoore and the “Density” of the Graphic Novel. In Digital Humanities, DH 2019.

Böttcher, S., &; Hartel, R. (2018). RECUT: RE-Compressing partially Unordered Trees. In 2018 IEEE International Conference on Big Data (Big Data) (pp. 3996–4005).https://doi.org/10.1109/bigdata.2018.8622261 

Dunst, A., &; Hartel, R. (2018). Automated Genre and Author Distinction in Comics: Towards a Stylometry for Visual Narrative. In Digital Humanities 2018: Book of Abstracts/Libro de resúmenes (pp. 184–187). Red de Humanidades Digitales AC.

Dunst, A., &; Hartel, R. (2018). The quantitative analysis of comics: Towards a visual stylometry of graphic narrative. In A. Dunst, J. Laubrock, &; J. Wildfeuer (Eds.), Empirical Comics Research: Digital, Multimodal, and Cognitive Methods (pp. 43–61). Routledge.

Dunst, A., &; Hartel, R. (2018). Auf dem Weg zur Visuellen Stilometrie:Automatische Genre- und Autorunterscheidung in graphischen Narrativen. In DHd Konferenz 2018, Kritik der digitalen Vernunft, DHd 2018.

Dunst, A., &; Hartel, R. (2017). Corpora and Complex Networks as Cultural Critique: Investigating Race and Gender Bias in Graphic Narratives. In Digital Humanities 2017, DH 2017, Conference Abstracts.

Dunst, A., Hartel, R., &; Laubrock, J. (2017). The Graphic Narrative Corpus (GNC): Design, Annotation, and Analysis for the Digital Humanities. In nd International Workshop on coMics Analysis, Processing, and Understanding, 14th IAPR International Conference on Document Analysis and Recognition, ICDAR (Vol. 3, pp. 15–20). IEEE.https://doi.org/10.1109/icdar.2017.286 

Böttcher, S., Hartel, R., &; Manuel, J. (2017). A column-oriented text database API implemented on top of wavelet tries. In DBKDA 2017.

Böttcher, S., Hartel, R., &; Wolters, D. (2016). CX: From relational data via SQL/XML to (Un-)Compressed XML. Information Systems, 56, 198–213.https://doi.org/10.1016/j.is.2015.09.011 

Dunst, A., Hartel, R., Hohenstein, S., &; Laubrock, J. (2016). Corpus Analyses of Multimodal Narrative: The Example of Graphic Novels. In Digital Humanities 2016, DH 2016, Conference Abstracts (pp. 178–180).

Böttcher, S., Hartel, R., Jacobs, T., &; Maneth, S. (2016). Incremental updates on compressed XML. In 2016 IEEE 32nd International Conference on Data Engineering (ICDE) (pp. 1026–1037). IEEE.https://doi.org/10.1109/icde.2016.7498310 

Dunst, A., &; Hartel, R. (2016). Die Corpusanalyse multimodaler Erzählungen am Beispiel graphischer Romane. In DHd-Tagung 2015, Modellierung - Vernetzung - Visualisierung, Die Digital Humanities als fächerübergreifendes Forschungsparadigma.

Böttcher, S., Hartel, R., Jacobs, T., &; Maneth, S. (2015). OnlineRePair: A Recompressor for XML Structures. In 2015 Data Compression Conference (p. 439). Springer.https://doi.org/10.1109/dcc.2015.58 

Böttcher, S., Hartel, R., Jacobs, T., &; Jeromin, M. (2015). ECST – Extended Context-Free Straight-Line Tree Grammars. In Data Science - 30th British International Conference on Databases, BICOD 2015 (pp. 186–198). Springer.https://doi.org/10.1007/978-3-319-20424-6_18 

Böttcher, S., Hartel, R., &; Thiele, S. (2014). Difference Computation for Grammar-Compressed XML Data. In Proceedings of the Second Australasian Web Conference (pp. 3–12). Australian Computer Society, Inc.

Böttcher, S., Brandenburg, M., &; Hartel, R. (2014). Keyword Search on DAG-Compressed XML Data. In Proceedings of the Second Australasian Web Conference (pp. 13–20). Australian Computer Society, Inc.

Böttcher, S., Hartel, R., &; Rabe, J. (2014). Efficient XML Keyword Search Based on DAG-Compression. In Database and Expert Systems Applications - 25th International Conference, DEXA 2014 (pp. 122–137). Cham: Springer.https://doi.org/10.1007/978-3-319-10073-9_11 

Böttcher, S., Feldotto, M., &; Hartel, R. (2013). Schema-based Parallel Compression and Decompression of XML Data. In WEBIST 2013 - Proceedings of the 9th International Conference on Web Information Systems and Technologies, Aachen, Germany, 8-10 May, 2013 (pp. 77–86).https://doi.org/10.5220/0004366300770086 

Böttcher, S., Hartel, R., &; Jacobs, T. (2013). Fast Multi-update Operations on Compressed XML Data. In Big Data - 29th British National Conference on Databases, BNCOD 2013, (pp. 149–164). Berlin, Heidelberg: Springer.https://doi.org/10.1007/978-3-642-39467-6_15 

Böttcher, S., Brandenburg, M., &; Hartel, R. (2013). DAG - Index - A Compressed Index for XML Keyword Search. In WEBIST 2013 - Proceedings of the 9th International Conference on Web Information Systems and Technologies (pp. 137–140). SciTePress.

Böttcher, S., Bültmann, A., Hartel, R., &; Schlüßler, J. (2013). Implementing Efficient Updates in Compressed Big Text Databases. In International Conference on Database and Expert Systems Applications (pp. 189–202). Springer.

Böttcher, S., Hartel, R., &; Heindorf, S. (2012). Optimized XPath evaluation for Schema-compressed XML data. In ADC (Vol. 124, pp. 137–144). Australian Computer Society.

Böttcher, S., Bokermann, D., &; Hartel, R. (2012). Generalizing and Improving SQL/XML Query Evaluation. In 8th International Conference on Signal Image Technology and Internet Based Systems (SITIS’12). IEEE.https://doi.org/10.1109/sitis.2012.72 

Böttcher, S., Hartel, R., &; Weber, S. (2012). Efficient String-Based XML Stream Prefiltering. In Proceedings of the Twenty-Third Australasian Database Conference (pp. 145–152). Australian Computer Society, Inc.

Böttcher, S., Bültmann, A., Hartel, R., &; Schlüßler, J. (2012). Fast Insertion and Deletion in Compressed Texts. In 2012 Data Compression Conference (p. 393). IEEE.https://doi.org/10.1109/dcc.2012.50 

Böttcher, S., Bokermann, D., &; Hartel, R. (2011). Computing Compressed XML Data from Relational Databases. In Advances in Databases - 28th British National Conference on Databases, BNCOD 28, Revised Selected Papers (Vol. 7051, pp. 209–220). Springer Berlin/Heidelberg.

Benter, M., Böttcher, S., &; Hartel, R. (2011). Mixing Bottom-Up and Top-Down XPath Query Evaluation. In East European Conference on Advances in Databases and Information Systems (pp. 27–41). Springer.https://doi.org/10.1007/978-3-642-23737-9_3 

Bätz, A., Böttcher, S., &; Hartel, R. (2011). Updates on Grammar-Compressed XML Data. In Advances in Databases - 28th British National Conference on Databases, BNCOD 28, Revised Selected Papers (pp. 154–166). Springer.https://doi.org/10.1007/978-3-642-24577-0_17 

Böttcher, S., Hartel, R., &; Stey, S. (2011). TraCX: Transformation of Compressed XML. In Advances in Databases - 28th British National Conference on Databases, BNCOD 28, Revised Selected Papers (pp. 182–193). Springer.https://doi.org/10.1007/978-3-642-24577-0_19 

Böttcher, S., Bültmann, A., &; Hartel, R. (2011). Search and Modification in Compressed Texts. In 2011 Data Compression Conference (pp. 403–412). IEEE.https://doi.org/10.1109/dcc.2011.47 

Böttcher, S., Fernhomberg, L., &; Hartel, R. (2011). Enhancing XML-cache Efficiency by XML Compression. In WEBIST 2011, Proceedings of the 7th International Conference on Web Information Systems and Technologies (pp. 80–87). SciTePress.

Böttcher, S., Fernhomberg, L., &; Hartel, R. (2011). Reducing Data Transfer by Combining XML-Compression and XML-Caching. In Web Information Systems and Technologies - 7th International Conference, WEBIST 2011, Revised Selected Papers (pp. 116–130). Springer.https://doi.org/10.1007/978-3-642-28082-5_9 

Böttcher, S., Hartel, R., &; Hawicks, H. (2011). Namenlemmatisierung in der Web-Datenbank mittelalterlicher und frühneuzeitlicher Universitätsmatrikel. In XXIV ICOS Internationales Kongress für Namensforschung.

Böttcher, S., Hartel, R., &; Messinger, C. (2010). Queryable SEPA Message Compression by XML Schema Subtraction. In ICEIS 2010 - Proceedings of the 12th International Conference on Enterprise Information Systems (pp. 23–29).

Böttcher, S., Hartel, R., &; Krislin, C. (2010). CluX - Clustering XML Sub-trees. In ICEIS 2010 - Proceedings of the 12th International Conference on Enterprise Information Systems (pp. 142–150).

Böttcher, S., Hartel, R., &; Messinger, C. (2010). Using XML Schema Subtraction to Compress Electronic Payment Messages. In Enterprise Information Systems - 12th International Conference, ICEIS 2010, Revised Selected Papers (pp. 451–463). Springer.https://doi.org/10.1007/978-3-642-19802-1_31 

Böttcher, S., Hartel, R., &; Messinger, C. (2010). Searchable Compression of Office Documents by XML Schema Subtraction. In Database and XML Technologies - 7th International XML Database Symposium, XSym 2010 (pp. 103–112). Springer.https://doi.org/10.1007/978-3-642-15684-7_9 

Böttcher, S., &; Hartel, R. (2009). Information disclosure by answers to XPath queries. Journal of Computer Security, 17(1), 69–99.https://doi.org/10.3233/jcs-2009-0318 

Böttcher, S., &; Hartel, R. (2009). CSC: Supporting Queries on Compressed Cached XML. In Database Technologies 2009, Twentieth Australasian Database Conference, ADC 2009 (pp. 153–160). Australian Computer Society, Inc.

Böttcher, S., Hartel, R., &; Messinger, C. (2009). XML Stream Data Reduction by Shared KST Signatures. In 2009 42nd Hawaii International Conference on System Sciences. IEEE.https://doi.org/10.1109/hicss.2009.513 

Hartel, R. (2008). Navigierbare Kompression von XML-Datenströmen. University of Paderborn, Germany.

Böttcher, S., Hartel, R., &; Kirschner, M. (2008). Detecting Suspicious Relational Database Queries. In Third International Conference on Availability, Reliability and Security (pp. 771–778). IEEE.https://doi.org/10.1109/ares.2008.125 

Böttcher, S., Hartel, R., &; Heinzemann, C. (2008). BSBC: Towards a Succinct Data Format for XML Streams. In WEBIST 2008, Proceedings of the Fourth International Conference on Web Information Systems and Technologies (pp. 13–21). INSTICC.

Böttcher, S., Hartel, R., &; Heinzemann, C. (2008). Compressing XML Data Streams with DAG+BSBC. In Web Information Systems and Technologies, 4th International Conference, WEBIST 2008, Revised Selected Papers (pp. 65–79). Springer.https://doi.org/10.1007/978-3-642-01344-7_6 

Böttcher, S., &; Steinmetz, R. (2007). Evaluating XPath Queries on XML Data Streams. In Data Management. Data, Data Everywhere, 24th British National Conference on Databases, BNCOD 24 (pp. 101–113). Springer.https://doi.org/10.1007/978-3-540-73390-4_10 

Böttcher, S., &; Steinmetz, R. (2007). Data Management for Mobile Ajax Web 2.0 Applications. In Database and Expert Systems Applications, 18th International Conference, DEXA 2007 (pp. 424–433). Springer.https://doi.org/10.1007/978-3-540-74469-6_42 

Böttcher, S., Steinmetz, R., &; Klein, N. (2007). XML index compression by DTD subtraction. In ICEIS 2007 - Proceedings of the Ninth International Conference on Enterprise Information Systems (pp. 86–94).

Böttcher, S., &; Steinmetz, R. (2006). DTD-Driven Structure Preserving XML Compression. In Flexible and Efficient Information Handling, 23rd British National Conference on Databases, BNCOD 23 (pp. 266–269). Berlin, Heidelberg.https://doi.org/10.1007/11788911_27 

Böttcher, S., &; Steinmetz, R. (2006). Finding the Leak: A Privacy Audit System for Sensitive XML Databases. In 22nd International Conference on Data Engineering Workshops (ICDEW’06). IEEE.https://doi.org/10.1109/icdew.2006.61 

Böttcher, S., &; Steinmetz, R. (2006). Information Disclosure by XPath Queries. In Secure Data Management, Third VLDB Workshop, SDM 2006 (pp. 160–174). Springer.https://doi.org/10.1007/11844662_12 

Böttcher, S., &; Steinmetz, R. (2005). Adaptive XML Access Control Based on Query Nesting, Modification and Simplification. In Datenbanksysteme in Business, Technologie und Web, 11. Fachtagung des GI-Fachbereichs “Datenbanken und Informationssysteme” (DBIS) (pp. 295–304).

Böttcher, S., &; Steinmetz, R. (2005). Embedding XML Schema Constraints in Search-Based Intersection Tests for XPath Query Optimization. In 16th International Workshop on Database and Expert Systems Applications (DEXA’05) (pp. 842–846). IEEE.https://doi.org/10.1109/dexa.2005.83 

Böttcher, S., &; Steinmetz, R. (2005). Detecting Privacy Violations in Sensitive XML Databases. In Secure Data Management, Second VLDB Workshop, SDM 2005 (pp. 143–154). Springer.https://doi.org/10.1007/11552338_10 

Böttcher, S., &; Steinmetz, R. (2004). Optimized Internet Search Based on a Intersection Test for XPath Expressions under a DTD. In Proceedings of the International Conference on Internet Computing, IC ’04 (pp. 587–593).

Böttcher, S., &; Steinmetz, R. (2003). Testing Containment of XPath Expressions in Order to Reduce the Data Transfer to Mobile Clients. In Advances in Databases and Information Systems, 7th East European Conference, ADBIS 2003 (pp. 400–410). Springer.https://doi.org/10.1007/978-3-540-39403-7_30 

Böttcher, S., &; Steinmetz, R. (2003). A DTD Graph Based XPath Query Subsumption Test. In Database and XML Technologies, First International XML Database Symposium, XSym 2003 (pp. 85–99). Berlin, Heidelberg.https://doi.org/10.1007/978-3-540-39429-7_6 

Böttcher, S., &; Steinmetz, R. (2003). A Subset Test for XPath Expressions under DTDs. In 20th British National Conference on Databases, BNCOD 20, Poster Papers (pp. 43–45).