Uncu, N., B. Bulğurcu, and F. Kılıç. “Distance Restricted Maximal Covering Model for Pharmacy Duty Scheduling Problem”. An International Journal of Optimization and Control: Theories & Applications (IJOCTA), vol. 8, no. 2, June 2018, pp. 208-15, doi:10.11121/ijocta.01.2018.00557.