@article{RSMUP_1985__73__95_0,
     author = {Marcu, D\u{a}nu\c{t}},
     title = {Note on the regular digraphs},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {95--98},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {73},
     year = {1985},
     mrnumber = {799900},
     zbl = {0575.05033},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1985__73__95_0/}
}