A. Sarma, X. Dong, и A. Halevy. Conceptual Modeling: Foundations and Applications, том 5600 из Lecture Notes in Computer Science, Springer, Berlin / Heidelberg, (2009)
V. Isomöttönen, V. Korhonen, и T. Kärkkäinen. 8th International Conference on Agile Processes in Software Engineering and Extreme Programming, том 4536 из LNCS, стр. 145-148. Berlin Heidelberg, Springer-Verlag, (2007)