@article{10_4153_CJM_1966_067_7,
     author = {Ostrom, T. G.},
     title = {Replaceable {Nets,} {Net} {Collineations,} and {Net} {Extensions}},
     journal = {Canadian journal of mathematics},
     pages = {666--672},
     year = {1966},
     volume = {18},
     number = {1},
     doi = {10.4153/CJM-1966-067-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1966-067-7/}
}