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@article{MZ_1982__181_173241, author = {Dieter Jungnickel}, title = {On {Subdesigns} of {Symmetric} {Designs.}}, journal = {Mathematische Zeitschrift}, pages = {383--394}, publisher = {mathdoc}, volume = {181}, year = {1982}, zbl = {0496.05008}, url = {http://geodesic.mathdoc.fr/item/MZ_1982__181_173241/} }
Dieter Jungnickel. On Subdesigns of Symmetric Designs.. Mathematische Zeitschrift, Tome 181 (1982), pp. 383-394. http://geodesic.mathdoc.fr/item/MZ_1982__181_173241/