Stoyan, Y. G., Grebennik, I. V., Kalashnikov, V. V., & Lytvynenko, O. S. (2018). Enumeration and Generation of Permutations with a Partially Fixed Order of Elements. International Journal of Combinatorial Optimization Problems and Informatics, 8(1), 19–30. Retrieved from https://ijcopi.org/ojs/article/view/4