@article{MZ_1978__163_172756,
     author = {Jean Doyen and X. Hubaut and M. Vandensavel},
     title = {Ranks of {Incidence} {Matrices} of {Steiner} {Triple} {Systems.}},
     journal = {Mathematische Zeitschrift},
     pages = {251--260},
     publisher = {mathdoc},
     volume = {163},
     year = {1978},
     zbl = {0373.05011},
     url = {http://geodesic.mathdoc.fr/item/MZ_1978__163_172756/}
}