@article{10_4153_CMB_1964_051_8,
     author = {Ostrom, T. G. and Sherk, F. A.},
     title = {Finite {Projective} {Planes} with {Affine} {Subplanes}},
     journal = {Canadian mathematical bulletin},
     pages = {549--559},
     year = {1964},
     volume = {7},
     number = {4},
     doi = {10.4153/CMB-1964-051-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1964-051-8/}
}