Dursun, T., Y. Su, R. Cosgun, A. S. Durak, and B. Yet. “COTTAPP: An Online University Timetable Application Based on a Goal Programming Model”. International Journal of Intelligent Systems and Applications in Engineering, vol. 5, no. 3, Sept. 2017, pp. 117-23, doi:10.18201/ijisae.2017531426.