New Eulerian Numbers of Type $D$. - Anna Borowiec; Wojciech Mlotkowski (Electron. J. Comb., 2016)

Permutations of Type B with Fixed Number of Descents and Minus Signs. - Katarzyna Kril; Wojciech Mlotkowski (Electron. J. Comb., 2019)

Some relatives of the Catalan sequence. - Elzbieta Liszewska; Wojciech Mlotkowski (Adv. Appl. Math., 2020)