G. Engels and G. Rozenberg, Abstracts COMPUGRAPH II Workshop. Vakgroep Informatica, Rijksuniversiteit Leiden, 1993.
LibreCat: /record/8192

G. Engels and L. Groenewegen, “Modular, Visual Specifications of Software Processes,” in Proceedings of the Workshop on Software Process (ISPW 1993), Wadern (Germany), 1993, pp. 66–68.
LibreCat: /record/8262

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

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

G. Engels and P. Löhr-Richter, “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), 1992, pp. 19–22.
LibreCat: /record/8260

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

U. Hohenstein and G. Engels, “SQL/EER - Syntax and Semantics of an Entity-Relationship-Based Query Language,” Information Systems, vol. 17, no. 3, pp. 209–242, 1992.
LibreCat: /record/7408
DOI: http://dx.doi.org/10.1016/0306-4379(92)90014-E

G. Engels, C. Lewerentz, M. Nagl, W. Schäfer, and A. Schürr, “Building Integrated Software Development Environments, Part I: Tool Specification,” ACM Transactions on Software Engineering and Methodology (TOSEM), vol. 1, no. 2, pp. 135–167, 1992.
LibreCat: /record/7409

G. Engels et al., “Conceptual Modelling of Database Applications Using an Extended ER Model,” Data &; Knowledge Engineering, vol. 9, no. 2, pp. 157–204, 1992.
LibreCat: /record/7410
DOI: http://dx.doi.org/10.1016/0169-023X(92)90008-Y

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

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

G. Engels, “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), 1990, vol. 532, pp. 344–362.
LibreCat: /record/8259
DOI: http://dx.doi.org/10.1007/BFb0017372

J. Ebert and G. Engels, “Konzepte einer Software-Architektur-Beschreibungssprache,” in Software-Entwicklung: Konzepte, Erfahrungen, Perspektiven, Fachtagung, 1989, Marburg (Germany), 1989, vol. 212, pp. 238–250.
LibreCat: /record/7821

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

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

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

G. Engels and W. Schäfer, Programmentwicklungsumgebungen: Konzepte und Realisierung. Stuttgart: Teubner, 1989.
LibreCat: /record/7511

G. Engels, T. Janning, and W. Schäfer, “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), 1988, pp. 1–10.
LibreCat: /record/7818
DOI: http://dx.doi.org/10.1145/62453.62454

G. Engels, U. Hohenstein, L. Neugebauer, G. Saake, and H.-D. Ehrich, “Konzeption einer integrierten Datenbank-Entwurfsumgebung,” in Proceedings of DBTA/SI Data Dictionaries und Entwicklungswerkzeuge für Datenbank-Anwendungen, Zürich, Switzerland, 1988, pp. 151–157.
LibreCat: /record/7819

G. Engels, U. Hohenstein, G. Saake, and H.-D. Ehrich, “Auf dem Weg zu einer integrierten Datenbank-Entwurfsumgebung,” in Proceedings of the GI-Workshop on “Sprachspezifische Programmierumgebungen,” 1988, pp. 38–51.
LibreCat: /record/7820