%0 Journal Article %A Schwab, Emil Daniel %T A bisimple inverse monoid of quadruples of non-negative integers. The Möbius function %J Discussiones Mathematicae. General Algebra and Applications %D 2024 %P 111-126 %V 44 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DMGAA_2024_44_1_a7/ %G en %F DMGAA_2024_44_1_a7