• Why information systems modelling is difficultJaakkola, Hannu; Henno, Jaak; Welzer-Družovec, Tatjana; Thalheim, Bernhard; Mäkelä, JukkaProceedings of the Fifth Workshop on Software Quality Analysis, Monitoring, Improvement, and Applications : SQAMIA 2016 : Budapest, Hungary, August 29-31, 20162016 / p. 29-39 : ill http://ceur-ws.org/Vol-1677/ https://www.scopus.com/sourceid/21100218356 https://www.scopus.com/record/display.uri?eid=2-s2.0-84988917450&origin=inward&txGid=bba4cf8149c7cbb88440776b223df41a