C. Peters, и M. Zaki. Working Paper Series of the Cambridge Service Alliance, Cambridge, UK, Cambridge Service Alliance, University of Cambridge, (2018)
L. Grunske, и P. Zhang. Proceedings of the the 7th joint meeting of the European software engineering conference and the ACM SIGSOFT symposium on The foundations of software engineering, стр. 183--192. New York, NY, USA, ACM, (2009)