Optimization Problems and Their Applications 7th International Conference, OPTA 2018, Omsk, Russia, July 8-14, 2018, Revised Selected Papers - Eremeev, Anton; Eremeev, Anton; Khachay, Michael; Khachay, Michael; Kochetov, Yury; Kochetov, Yury; Pardalos, Panos; Pardalos, Panos (Springer International Publishing : Imprint: Springer, 2018)