%0 Journal Article %A Schmidt, Roland %T On the Occurrence of the Complete Graph $K_5$ in the Hasse Graph of a Finite Group %J Rendiconti del Seminario Matematico della Università di Padova %D 2006 %P 99-124 %V 115 %I Seminario Matematico of the University of Padua %U http://archive.numdam.org/item/RSMUP_2006__115__99_0/ %G en %F RSMUP_2006__115__99_0