@article{RSMUP_2013__129__17_0,
     author = {De Medts, Tom and Mar\'oti, Attila},
     title = {Perfect numbers and finite groups},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {17--34},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {129},
     year = {2013},
     mrnumber = {3090628},
     zbl = {1280.20026},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_2013__129__17_0/}
}