@article{RSMUP_1973__50__355_0,
     author = {Napolitani, Franco},
     title = {Submodularit\`a nei gruppi finiti},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {355--363},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {50},
     year = {1973},
     mrnumber = {360847},
     zbl = {0297.20035},
     language = {it},
     url = {http://www.numdam.org/item/RSMUP_1973__50__355_0/}
}