@article{MASLO_1968__18_4_a2,
     author = {Kotzig, Anton},
     title = {Sur le nombre des $4$-cycles dans un tournoi},
     journal = {Mathematica slovaca},
     pages = {247--254},
     publisher = {mathdoc},
     volume = {18},
     number = {4},
     year = {1968},
     mrnumber = {0250923},
     zbl = {0167.22304},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1968__18_4_a2/}
}