@article{GDZPPN002185431,
title = {Projective homomorphisms and extensions of lattices.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {247},
year = {1971},
pages = {41-45},
zbl = {0208.04204},
url = {http://dml.mathdoc.fr/item/GDZPPN002185431}
}
Roggenkamp, Klaus W. Projective homomorphisms and extensions of lattices.. Journal für die reine und angewandte Mathematik, Tome 247 (1971) pp. 41-45. http://gdmltest.u-ga.fr/item/GDZPPN002185431/