@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/}
}