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@article{MZ_1967__97_170703, author = {T.G. Ostrom}, title = {Closure with {Respect} to {Subplanes.}}, journal = {Mathematische Zeitschrift}, pages = {57--65}, publisher = {mathdoc}, volume = {97}, year = {1967}, zbl = {0144.19503}, url = {http://geodesic.mathdoc.fr/item/MZ_1967__97_170703/} }
T.G. Ostrom. Closure with Respect to Subplanes.. Mathematische Zeitschrift, Tome 97 (1967), pp. 57-65. http://geodesic.mathdoc.fr/item/MZ_1967__97_170703/