EREMEEV, Anton Valentinovich; KOVALENKO, Yulia Viktorovna. On Solving Travelling Salesman Problem with Vertex Requisitions. Yugoslav Journal of Operations Research, [S.l.], v. 27, n. 4, p. 415–426, mar. 2017. ISSN 2334-6043. Available at: <http://yujor.fon.bg.ac.rs/index.php/yujor/article/view/54>. Date accessed: 22 july 2018.