Gerhard Post, Jeffrey H. Kingston, Samad Ahmadi, Sophia Daskalaki, Christos Gogos, Jari Kyngäs, Cimmo Nurmi, Nysret Musliu, Nelishia Pillay, Haroldo Santos, Andrea Schaerf. XHSTT: an XML archive for high school timetabling problems in different countries. Annals OR, 218(1):295-301, 2014. [doi]