@article{10_4153_CJM_1978_074_7,
     author = {Ebert, Gary L.},
     title = {Blocking {Sets} in {Projective} {Spaces}},
     journal = {Canadian journal of mathematics},
     pages = {856--862},
     year = {1978},
     volume = {30},
     number = {4},
     doi = {10.4153/CJM-1978-074-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1978-074-7/}
}