D. Spinellis, P. Louridas, and M. Kechagia. Proceedings of the 38th International Conference on Software Engineering, page 748--759. New York, NY, USA, ACM, (2016)
U. Priss. Proceedings of the 19th International Conference on Conceptual Structures (ICCS 2011), volume 6828 of Lecture Notes in Computer Science, page 243-256. Springer, (2011)