A Hybrid Query Language for the Extended Entity Relationship Model
M. Andries, G. Engels, Journal of Visual Languages and Computing 7 (1996) 321–352.

Tight Integration on One Document: The Programming Environment
G. Engels, M. Nagl, W. Schäfer, B. Westfechtel, in: Building Tightly Integrated Software Development Environments: The IPSEN Approach, Springer, Berlin/Heidelberg, 1996, pp. 170–177.

Attributed Graph Transformations with Controlled Application of Rules
R. Heckel, J. Müller, G. Taentzer, A. Wagner, in: Proceedings of the Colloquium on Graph Transformation and Its Application in Computer Science, Universitat de les Illes Balears, 1995.

Record Linkage of Anonymous Data by Control Numbers
W. Thoben, H.-J. Appelrath, S. Sauer, in: Proceedings of the 18th Annual Conference of the Gesellschaft Für Klassifikation, Oldenburg (Germany), Springer, Berlin/Heidelberg, 1995, pp. 412–419.

Embedding of Conditional Graph Transformations
R. Heckel, in: Proceedings of the Colloquium on Graph Transformation and Its Application in Computer Science, Universitat de les Illes Balears, 1995.

Graphische Spezifikation ausgewählter Teile von AGG - einem algebraischen Graphgrammatiksystem
M. Conrad, M. Gajewsky, R. Holl-Biniasz, M. Rudolf, J. Demuth, S. Weber, R. Heckel, J. Müller, G. Taentzer, A. Wagner, Graphische Spezifikation Ausgewählter Teile von AGG - Einem Algebraischen Graphgrammatiksystem, 1995.

Specialization of Object Life Cycle Definitions
J. Ebert, G. Engels, Specialization of Object Life Cycle Definitions, University of Koblenz-Landau, Koblenz, 1995.

Encapsulated Hierarchical Graphs, Graph Types, and Meta Types
G. Engels, A. Schürr, Encapsulated Hierarchical Graphs, Graph Types, and Meta Types, Vakgroep Informatica, Rijksuniversiteit Leiden, 1995.

Coordination by Behavioural Views and Communication Patterns
L. Groenewegen, G. Engels, in: Proceedings of the 4th European Workshop on Software Process Technology (EWSPT 1995), Noordwijkerhout (The Netherlands), Springer, Berlin/Heidelberg, 1995, pp. 189–192.

A Compositional Approach to Structuring and Refinement of Typed Graph Grammars
A. Corradini, R. Heckel, in: Proceedings of the Joint COMPUGRAPH/SEMAGRAPH Workshop on Graph Rewriting and Computation (SEGRAGRA 1995), Volterra (Italy), Elsevier, 1995, pp. 46–55.

GRAPHIT: Graphical Support and Integration of Formal and Semiformal Methods for Software Specification and Development
B. Bardohl, R. Bardohl, P. Castro, H. Ehrig, R. Heckel, L. Ribeiro, D. Nunes, A. Martini, in: Proceedings of the 3rd German-Brazilian Workshop on Information Technology (1995), Berlin (Germany), Forschungszentrum Jülich GmbH, 1995.

Encapsulated Hierarchical Graphs, Graph Types, and Meta Types
G. Engels, A. Schürr, in: Proceedings of the Joint COMPUGRAPH/SEMAGRAPH Workshop on Graph Rewriting and Computation (SEGRAGRA 1995), Volterra (Italy), Elsevier, Amsterdam, The Netherlands, 1995, pp. 101–109.

Ensuring Consistency of Conditional Graph Grammars - A constructive Approach
R. Heckel, A. Wagner, in: Proceedings of the Joint COMPUGRAPH/SEMAGRAPH Workshop on Graph Rewriting and Computation (SEGRAGRA 1995), Volterra (Italy), Elsevier, 1995, pp. 118–126.

Fundamentals of Object-Oriented Languages, Systems, and Methods
H.-D. Ehrich, G. Engels, J. Paredaens, J. Wegner, eds., Fundamentals of Object-Oriented Languages, Systems, and Methods, Schloss Dagstuhl, Leibniz Center for Informatics, 1994.

Graph Gramars and Their Application to Computer Science, 5th International Workshop (1994), Selected Papers
J. Cuny, H. Ehrig, G. Engels, G. Rozenberg, eds., Graph Gramars and Their Application to Computer Science, 5th International Workshop (1994), Selected Papers, Springer, Berlin/Heidelberg, 1994.

Berücksichtigung von Datenschutzaspekten in einem bevölkerungsbezogenen Krebsregister
W. Thoben, H.-J. Appelrath, J. Rettig, S. Sauer, in: Proceedings of the Conference on Medizin Und Information, Biometrie Und Epidemiologie (GMDS 1994), Dresden (Germany), MMV Medizin Verlag, München, 1994, pp. 88–90.

Structural and Behavioural Views on OMT-Classes
J. Ebert, G. Engels, in: Proceedings of the International Symposium on Object-Oriented Methodologies and Systems (ISOOMS 1994), Palermo (Italy), Springer, Berlin/Heidelberg, 1994, pp. 142–157.

Object-Oriented System Development: Will the New Approach Solve Old Problems?
G. Engels, G. Kappel, in: Proceedings of the IFIP 13th World Computer Congress on Information Processing, Hamburg (Germany), Elsevier, 1994, pp. 434–441.

Towards a Module Concept for Graph Transformation Systems: The Software Engineering Perspective
G. Engels, H. Ehrig, in: Proceedings Colloquium on Graph Transformation and Its Application in Computer Science, Universitat de les Illes Balears, Departament de Ci, 1994.

Observable or Invocable Behaviour - You Have to Choose
J. Ebert, G. Engels, Observable or Invocable Behaviour - You Have to Choose, Vakgroep Informatica, Rijksuniversiteit Leiden, 1994.

Syntax and Semantics of Hybrid Database Languages
M. Andries, G. Engels, in: Proceedings of the International Workshop on Graph Transformations in Computer Science (1993), Dagstuhl (Germany), Springer, Berlin/Heidelberg, 1994, pp. 19–36.

Specification of coordinated behaviour by SOCCA
G. Engels, L. Groenewegen, in: Proceedings of the Third European Workshop on Software Process Technology (EWSPT 1994), Villard de Lans (France), Springer, Berlin/Heidelberg, 1994, pp. 128–151.

Visual Specification of Complex Database Actions
G. Engels, P. Löhr, in: Proceedings of the 2nd International East/West Database Workshop, Klagenfurt (Germany), Springer, Berlin/Heidelberg, 1994, pp. 303–314.

Visuelles Spezifizieren von komplexen Aktionen auf Datenbankstrukturen
P. Löhr-Richter, G. Engels, GI-Datenbank Rundbrief 13 (1994) 33–35.

Design Representation
J. Ebert, G. Engels, in: Encyclopedia of Software Engineering, John Wiley &; Sons, Inc., 1994, pp. 382–394.

SOCCA: Specifications of Coordinated and Cooperative Activities
G. Engels, L. Groenewegen, in: Software Process Modelling and Technology, Research Studies Press, Taunton, 1994, pp. 71–102.

Integrationsaspekte bei verteilter Software-Entwicklung
G. Engels, A.A. Verrijn-Stuart, in: Fortschritt-Berichte VDI, VDI Verlag, 1993, pp. 45–53.

A Hybrid Query Language for the Extended Entity Relationship Model
M. Andries, G. Engels, A Hybrid Query Language for the Extended Entity Relationship Model, Vakgroep Informatica, Rijksuniversiteit Leiden, 1993.

Towards a Module Concept for Graph Transformation Systems
H. Ehrig, G. Engels, Towards a Module Concept for Graph Transformation Systems, Vakgroep Informatica, Rijksuniversiteit Leiden, 1993.

Abstracts COMPUGRAPH II Workshop
G. Engels, G. Rozenberg, Abstracts COMPUGRAPH II Workshop, Vakgroep Informatica, Rijksuniversiteit Leiden, 1993.

Modular, Visual Specifications of Software Processes
G. Engels, L. Groenewegen, in: Proceedings of the Workshop on Software Process (ISPW 1993), Wadern (Germany), IEEE Computer Society, Washington, DC, USA, 1993, pp. 66–68.

Functional Description of Parallel Processes
P. Koopman, L. Groenewegen, G. Engels, in: Proceedings of the Conference SION Computing Science in the Netherlands (CSN ’92), The Netherlands, 1992, pp. 156–167.

Visual Specifications of Conceptual Database Schemata (Abstract)
G. Engels, Visual Specifications of Conceptual Database Schemata (Abstract), Leiden University, 1992.

CADDY: A Highly Integrated Environment to Support Conceptual Database Design
G. Engels, P. Löhr-Richter, in: Proceedings of the Fifth International Workshop on Computer-Aided Software Engineering (CASE 1992), Montreal (Canada), IEEE Computer Society, Washington, DC, USA, 1992, pp. 19–22.

Specification of Coordinated Behaviour in the Software Development Process
G. Engels, L. Groenewegen, in: Proceedings of the Second European Workshop on Software Process Technology (EWSPT 92), Trondheim, Norway, Springer, Berlin/Heidelberg, 1992, pp. 58–60.

SQL/EER - Syntax and Semantics of an Entity-Relationship-Based Query Language
U. Hohenstein, G. Engels, Information Systems 17 (1992) 209–242.

Building Integrated Software Development Environments, Part I: Tool Specification
G. Engels, C. Lewerentz, M. Nagl, W. Schäfer, A. Schürr, ACM Transactions on Software Engineering and Methodology (TOSEM) 1 (1992) 135–167.

Conceptual Modelling of Database Applications Using an Extended ER Model
G. Engels, M. Gogolla, U. Hohenstein, K. Hülsmann, P. Löhr-Richter, G. Saake, H.-D. Ehrich, Data &; Knowledge Engineering 9 (1992) 157–204.

Incremental Design of Conceptual Database Schemata with CADDY
P. Löhr-Richter, G. Engels, Incremental Design of Conceptual Database Schemata with CADDY, Leiden University, Leiden University, P.O. Box 9500, 2300 RA Leiden, The Netherlands, 1991.

Formal Semantics of an Entity-Relationship Query Language
U. Hohenstein, G. Engels, in: Proceedings of the 9th International Conference on Entity-Relationship Approach (ER 90), Lausanne, Switzerland, ER Institute, 1990, pp. 177–188.

Elementary Actions on an Extended Entity-Relationship Database
G. Engels, in: Proceedings of the Workshop on Graph Grammars and Their Application to Computer Science (1990), Bremen (Germany), Springer, Berlin/Heidelberg, 1990, pp. 344–362.

Konzepte einer Software-Architektur-Beschreibungssprache
J. Ebert, G. Engels, in: Software-Entwicklung: Konzepte, Erfahrungen, Perspektiven, Fachtagung, 1989, Marburg (Germany), Springer, Berlin/Heidelberg, 1989, pp. 238–250.

CADDY-O: Syntaxgestütztes, graphisches Entwerfen konzeptioneller Datenbankschemata
G. Engels, in: Tagungsband GI-Fachtagung “Interaktive Schnittstellen Für Informationssysteme”, TU Clausthal, Notizen Zu Interaktive Systeme, 1989, pp. 1–16.

CADDY: Computer-Aided Design of Non-Standard Databases
G. Engels, U. Hohenstein, K. Hülsmann, P. Löhr-Richter, H.-D. Ehrich, in: Proceedings of the International Conference on System Development Environments &; Factories, Berlin, Germany, Pitman Publishing, Berlin, 1989.

Benutzerschnittstelle und Architektur der integrierten Datenbankentwurfsumgebung CADDY (Kurzfassung)
G. Engels, Benutzerschnittstelle Und Architektur Der Integrierten Datenbankentwurfsumgebung CADDY (Kurzfassung), TU Braunschweig, 1989.

Programmentwicklungsumgebungen: Konzepte und Realisierung
G. Engels, W. Schäfer, Programmentwicklungsumgebungen: Konzepte Und Realisierung, Teubner, Stuttgart, 1989.

A Highly Integrated Tool Set for Program Development Support
G. Engels, T. Janning, W. Schäfer, in: Proceedings of the Conference on ACM SIGSMALL/PC Symposium on ACTES (SIGSMALL 1988), Cannes (France), ACM Press, New York, NY, USA, 1988, pp. 1–10.

Konzeption einer integrierten Datenbank-Entwurfsumgebung
G. Engels, U. Hohenstein, L. Neugebauer, G. Saake, H.-D. Ehrich, in: Proceedings of DBTA/SI Data Dictionaries Und Entwicklungswerkzeuge Für Datenbank-Anwendungen, Zürich, Switzerland, Verlag der Fachvereine an den Schweiz. Hochschulen und Techniken, 1988, pp. 151–157.

Auf dem Weg zu einer integrierten Datenbank-Entwurfsumgebung
G. Engels, U. Hohenstein, G. Saake, H.-D. Ehrich, in: G. Engels, U. Hohenstein, G. Saake, H.-D. Ehrich (Eds.), Proceedings of the GI-Workshop on “Sprachspezifische Programmierumgebungen,” G. Snelting, Darmstadt (Germany), 1988, pp. 38–51.

Ein Konzept zur Beschreibung von Software-Architekturen
J. Ebert, G. Engels, Ein Konzept Zur Beschreibung von Software-Architekturen, EWH Koblenz, 1988.