Joanne M. Atlee Sandy Beidu Uli Fahrenberg Axel Legay Merging Features in Featured Transition Systems. 38-43 2015 MoDeVVa@MoDELS https://ceur-ws.org/Vol-1514/paper5.pdf conf/models/2015modevva db/conf/models/modevva2015.html#AtleeBFL15