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@article{MASLO_1978__28_1_a5, author = {Sudolsk\'y, Mari\'an}, title = {A generalization of the friendship theorem}, journal = {Mathematica slovaca}, pages = {57--59}, publisher = {mathdoc}, volume = {28}, number = {1}, year = {1978}, mrnumber = {527774}, zbl = {0366.05041}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1978__28_1_a5/} }
Sudolský, Marián. A generalization of the friendship theorem. Mathematica slovaca, Tome 28 (1978) no. 1, pp. 57-59. http://geodesic.mathdoc.fr/item/MASLO_1978__28_1_a5/