@article{MZ_1965__89_170437,
     author = {Daniel R. Hughes},
     title = {Extensions of designs and groups: projective, symplectic and certain affine groups.},
     journal = {Mathematische Zeitschrift},
     pages = {199--205},
     publisher = {mathdoc},
     volume = {89},
     year = {1965},
     zbl = {0136.28202},
     url = {http://geodesic.mathdoc.fr/item/MZ_1965__89_170437/}
}