Composition of services on hierarchical service modelsMaigre, Riina; Tõugu, EnnProceedings of the 21th [i. e. 21st] European-Japanese Conference on Information Modelling and Knowledge Bases : EJC2011 : Tallinn, Estonia, June 06-10, 2011. Vol. 12011 / p. 164-183 : ill https://ccdcoe.org/library/publications/composition-of-services-on-hierarchical-service-models/

Extending UML profiles to model integrity constraints in SQL databasesEessaar, Erki; Aaberg, ErkoProceedings of the 21th [i. e. 21st] European-Japanese Conference on Information Modelling and Knowledge Bases : EJC2011 : Tallinn, Estonia, June 06-10, 2011. Vol. 12011 / p. 47-65 : ill https://www.researchgate.net/publication/260291830_Extending_UML_Profiles_to_Model_Integrity_Constraints_in_SQL_Databases