TY - JOUR ID - 14246 TI - Preface JO - Communications in Combinatorics and Optimization JA - CCO LA - en SN - 2538-2128 Y1 - 2019 PY - 2019 VL - 4 IS - 2 SP - EP - DO - N2 - UR - http://comb-opt.azaruniv.ac.ir/article_14246.html L1 - http://comb-opt.azaruniv.ac.ir/article_14246_269d7ac6efb0c5c1f3921316e8277681.pdf ER -