@article{GDZPPN002182149, title = {o-projective ordered abelian groups.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, volume = {222}, year = {1966}, pages = {219-220}, zbl = {0158.03301}, url = {http://dml.mathdoc.fr/item/GDZPPN002182149} }
Weinberg, E.C. o-projective ordered abelian groups.. Journal für die reine und angewandte Mathematik, Tome 222 (1966) pp. 219-220. http://gdmltest.u-ga.fr/item/GDZPPN002182149/