On the Occurrence of the Complete Graph K 5 in the Hasse Graph of a Finite Group
Rendiconti del Seminario Matematico della Università di Padova, Tome 115 (2006), pp. 99-124. 
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     author = {Schmidt, Roland},
     title = {On the {Occurrence} of the {Complete} {Graph} $K_5$ in the {Hasse} {Graph} of a {Finite} {Group}},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {99--124},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {115},
     year = {2006},
     mrnumber = {2245590},
     zbl = {1167.20314},
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     url = {http://www.numdam.org/item/RSMUP_2006__115__99_0/}
}
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Schmidt, Roland. On the Occurrence of the Complete Graph $K_5$ in the Hasse Graph of a Finite Group. Rendiconti del Seminario Matematico della Università di Padova, Tome 115 (2006), pp. 99-124. http://www.numdam.org/item/RSMUP_2006__115__99_0/

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