- Ralph-Johan Back, Luigia Petre, Ivan Porres Paltor: Analysing UML Use Cases as Contracts, Second International Conference on the Unified Modeling Language: UML'99, 1999, (BibTeX entry).
- Ralph-Johan Back, Dag Björklund, Johan Lilius, Luka Milovanov, Ivan Porres: A Workbench to Experiment on New Model, Sixth International Conference on the Unified
Modeling Language - the Language and its applications, 2003, (BibTeX entry).
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- dblp: Computer Science Bibliography (University of Trier, Germany). (Note that this does not always work due to different naming schemes.)
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