@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/}
}