%0 Journal Article %A Tadeusz Konik %T The sets of the classes $\widetilde M_{p,k}$ and their subsets %J Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica %D 2008 %P 76-82 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/BASM_2008_3_a7/ %G en %F BASM_2008_3_a7