M. Di Penta, A. Santone, и M. Villani. 2nd international workshop on Service oriented software engineering: in conjunction with the 6th ESEC/FSE joint meeting, стр. 8--14. New York, NY, USA, ACM, (2007)
C. Britton, S. Jones, M. Kutar, M. Loomes, и B. Robinson. First International Conference on Theory and Application of Diagrams, стр. 376--391. Edinburgh, Scotland, UK, Springer Berlin, (сентября 2000)