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@article{MZ_1977__153_172488, author = {Hans Ludwig de Vries}, title = {On {Property} {B} and on {Steiner} {Systems.}}, journal = {Mathematische Zeitschrift}, pages = {155--160}, publisher = {mathdoc}, volume = {153}, year = {1977}, zbl = {0332.05012}, url = {http://geodesic.mathdoc.fr/item/MZ_1977__153_172488/} }
Hans Ludwig de Vries. On Property B and on Steiner Systems.. Mathematische Zeitschrift, Tome 153 (1977), pp. 155-160. http://geodesic.mathdoc.fr/item/MZ_1977__153_172488/