@article{10_4153_CMB_1962_018_2,
     author = {Ditor, Seymour},
     title = {A {New} {Kind} of {Free} {Extension} for {Projective} {Planes}},
     journal = {Canadian mathematical bulletin},
     pages = {167--170},
     year = {1962},
     volume = {5},
     number = {2},
     doi = {10.4153/CMB-1962-018-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1962-018-2/}
}