TY  - JOUR
TI  - Hierarchical mathematical modelling approach for a case study in university timetabling
AU  - DEMİR, Y.
AU  - ÇELİK, C.
JO  - Sigma Journal of Engineering and Natural Sciences
PY  - 2019
VL  - 37
SP  - 323
EP  - 339
DO  - 
ER  -