TY - JOUR AU - Schwab, Emil Daniel TI - A bisimple inverse monoid of quadruples of non-negative integers. The Möbius function JO - Discussiones Mathematicae. General Algebra and Applications PY - 2024 SP - 111 EP - 126 VL - 44 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DMGAA_2024_44_1_a7/ LA - en ID - DMGAA_2024_44_1_a7 ER -