J. Schneider, M. Kraus, and R. Westermann. VISIGRAPP (Selected Papers), volume 68 of Communications in Computer and Information Science, page 215-228. Springer, (2009)
C. Bech, A. Bork, J. Memborg, L. Rosenlund, and M. Kraus. ArtsIT/DLI, volume 196 of Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, page 197-204. Springer, (2016)