EmetsO. A., & KolechkinaL. M. (2000). Optimization Problem on Permutations with Linear-Fractional Objective Function: Properties of the Set of Admissible Solutions. Ukrains’kyi Matematychnyi Zhurnal, 52(12), 1630-1640. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/4567