J. Schmidt, H. Sehring, M. Skusa, и A. Wienberg. Proceedings of the Fifth East-European Conference on Advances in Databases and Information Systems, том 2151 из Lecture Notes in Computer Science, Springer, (2001)
H. Sehring, S. Bossung, P. Hupe, M. Skusa, и J. Schmidt. Proceedings of the Workshop Information Technologies for Business, International Baltic Conference on Databases and Information Systems, Baltic DB&IS 2006, Vilnius, Lithuania, стр. 39-51. IEEE, (2006)