@article{GDZPPN002399199,
title = {Closure with Respect to Subplanes.},
journal = {Mathematische Zeitschrift},
volume = {99},
year = {1967},
pages = {57-65},
zbl = {0144.19503},
url = {http://dml.mathdoc.fr/item/GDZPPN002399199}
}
Ostrom, T.G. Closure with Respect to Subplanes.. Mathematische Zeitschrift, Tome 99 (1967) pp. 57-65. http://gdmltest.u-ga.fr/item/GDZPPN002399199/