Engels, G., &; Rozenberg, G. (1993). Abstracts COMPUGRAPH II Workshop. Vakgroep Informatica, Rijksuniversiteit Leiden.
LibreCat: /record/8192

Engels, G., &; Groenewegen, L. (1993). Modular, Visual Specifications of Software Processes. In Proceedings of the Workshop on Software Process (ISPW 1993), Wadern (Germany) (pp. 66–68). Washington, DC, USA: IEEE Computer Society.
LibreCat: /record/8262

Koopman, P., Groenewegen, L., &; Engels, G. (1992). Functional Description of Parallel Processes. In Proceedings of the conference SION Computing Science in the Netherlands (CSN ’92), The Netherlands (pp. 156–167).
LibreCat: /record/7825

Engels, G. (1992). Visual Specifications of Conceptual Database Schemata (Abstract). Leiden University.
LibreCat: /record/8189

Engels, G., &; Löhr-Richter, P. (1992). CADDY: A Highly Integrated Environment to Support Conceptual Database Design. In Proceedings of the Fifth International Workshop on Computer-Aided Software Engineering (CASE 1992), Montreal (Canada) (pp. 19–22). Washington, DC, USA: IEEE Computer Society.
LibreCat: /record/8260

Engels, G., &; Groenewegen, L. (1992). Specification of Coordinated Behaviour in the Software Development Process. In Proceedings of the Second European Workshop on Software Process Technology (EWSPT 92), Trondheim, Norway (Vol. 635, pp. 58–60). Berlin/Heidelberg: Springer.http://dx.doi.org/10.1007/BFb0017495 
LibreCat: /record/8261
DOI: http://dx.doi.org/10.1007/BFb0017495

Hohenstein, U., &; Engels, G. (1992). SQL/EER - Syntax and Semantics of an Entity-Relationship-Based Query Language. Information Systems, 17(3), 209–242.http://dx.doi.org/10.1016/0306-4379(92)90014-E 
LibreCat: /record/7408
DOI: http://dx.doi.org/10.1016/0306-4379(92)90014-E

Engels, G., Lewerentz, C., Nagl, M., Schäfer, W., &; Schürr, A. (1992). Building Integrated Software Development Environments, Part I: Tool Specification. ACM Transactions on Software Engineering and Methodology (TOSEM), 1(2), 135–167.
LibreCat: /record/7409

Engels, G., Gogolla, M., Hohenstein, U., Hülsmann, K., Löhr-Richter, P., Saake, G., &; Ehrich, H.-D. (1992). Conceptual Modelling of Database Applications Using an Extended ER Model. Data &; Knowledge Engineering, 9(2), 157–204.http://dx.doi.org/10.1016/0169-023X(92)90008-Y 
LibreCat: /record/7410
DOI: http://dx.doi.org/10.1016/0169-023X(92)90008-Y

Löhr-Richter, P., &; Engels, G. (1991). Incremental Design of Conceptual Database Schemata with CADDY. Leiden University, P.O. Box 9500, 2300 RA Leiden, The Netherlands: Leiden University.
LibreCat: /record/8188

Hohenstein, U., &; Engels, G. (1990). Formal Semantics of an Entity-Relationship Query Language. In Proceedings of the 9th International Conference on Entity-Relationship Approach (ER 90), Lausanne, Switzerland (pp. 177–188). ER Institute.
LibreCat: /record/7824

Engels, G. (1990). Elementary Actions on an Extended Entity-Relationship Database. In Proceedings of the workshop on Graph Grammars and Their Application to Computer Science (1990), Bremen (Germany) (Vol. 532, pp. 344–362). Berlin/Heidelberg: Springer.http://dx.doi.org/10.1007/BFb0017372 
LibreCat: /record/8259
DOI: http://dx.doi.org/10.1007/BFb0017372

Ebert, J., &; Engels, G. (1989). Konzepte einer Software-Architektur-Beschreibungssprache. In Software-Entwicklung: Konzepte, Erfahrungen, Perspektiven, Fachtagung, 1989, Marburg (Germany) (Vol. 212, pp. 238–250). Berlin/Heidelberg: Springer.
LibreCat: /record/7821

Engels, G. (1989). CADDY-O: Syntaxgestütztes, graphisches Entwerfen konzeptioneller Datenbankschemata. In Tagungsband GI-Fachtagung “Interaktive Schnittstellen für Informationssysteme”, TU Clausthal, Notizen zu Interaktive Systeme (Vol. 18, pp. 1–16).
LibreCat: /record/7822

Engels, G., Hohenstein, U., Hülsmann, K., Löhr-Richter, P., &; Ehrich, H.-D. (1989). CADDY: Computer-Aided Design of Non-Standard Databases. In Proceedings of the International Conference on System Development Environments &; Factories, Berlin, Germany. Berlin: Pitman Publishing.
LibreCat: /record/7823

Engels, G. (1989). Benutzerschnittstelle und Architektur der integrierten Datenbankentwurfsumgebung CADDY (Kurzfassung). TU Braunschweig.
LibreCat: /record/8187

Engels, G., &; Schäfer, W. (1989). Programmentwicklungsumgebungen: Konzepte und Realisierung. Stuttgart: Teubner.
LibreCat: /record/7511

Engels, G., Janning, T., &; Schäfer, W. (1988). A Highly Integrated Tool Set for Program Development Support. In Proceedings of the conference on ACM SIGSMALL/PC symposium on ACTES (SIGSMALL 1988), Cannes (France) (pp. 1–10). New York, NY, USA: ACM Press.http://dx.doi.org/10.1145/62453.62454 
LibreCat: /record/7818
DOI: http://dx.doi.org/10.1145/62453.62454

Engels, G., Hohenstein, U., Neugebauer, L., Saake, G., &; Ehrich, H.-D. (1988). Konzeption einer integrierten Datenbank-Entwurfsumgebung. In Proceedings of DBTA/SI Data Dictionaries und Entwicklungswerkzeuge für Datenbank-Anwendungen, Zürich, Switzerland (pp. 151–157). Verlag der Fachvereine an den Schweiz. Hochschulen und Techniken.
LibreCat: /record/7819

Engels, G., Hohenstein, U., Saake, G., &; Ehrich, H.-D. (1988). Auf dem Weg zu einer integrierten Datenbank-Entwurfsumgebung. In G. Engels, U. Hohenstein, G. Saake, &; H.-D. Ehrich (Eds.), Proceedings of the GI-Workshop on “Sprachspezifische Programmierumgebungen” (pp. 38–51). Darmstadt (Germany): G. Snelting.
LibreCat: /record/7820