%0 Journal Article %T Preface %J Communications in Combinatorics and Optimization %I Azarbaijan Shahid Madani University %Z 2538-2128 %D 2019 %\ 12/01/2019 %V 4 %N 2 %P - %! Preface %R %X %U http://comb-opt.azaruniv.ac.ir/article_14246_269d7ac6efb0c5c1f3921316e8277681.pdf