@article{JRAM_1966__224_150772,
     author = {E.C. Weinberg},
     title = {o-projective ordered abelian groups.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {219--220},
     publisher = {mathdoc},
     volume = {224},
     year = {1966},
     zbl = {0158.03301},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1966__224_150772/}
}