Makhnei O, Pylypiv V, Zatorskii R. $m$-submultisets and $m$-permutations of multisets elements. Carpathian Math. Publ. [Internet]. 2021 Jun. 30 [cited 2024 Nov. 21];13(1):240-58. Available from: https://journals.pnu.edu.ua/index.php/cmp/article/view/4693