@article{MZ_1974__139_172114,
     author = {Benedict H. Gross},
     title = {Intersection {Triangles} and {Block} {Intersection} {Numbers} of {Steiner} {Systems.}},
     journal = {Mathematische Zeitschrift},
     pages = {87--104},
     publisher = {mathdoc},
     volume = {139},
     year = {1974},
     zbl = {0276.05018},
     url = {http://geodesic.mathdoc.fr/item/MZ_1974__139_172114/}
}