@article{CLTM_1971_1971_1_a5,
     author = {Spoerel, Detlef},
     title = {Projektive geordnete {Moduln} und n-fache {Erweiterungen} geordneter {Moduln.}},
     journal = {Collectanea mathematica},
     pages = {106-115},
     publisher = {mathdoc},
     volume = {22},
     number = {2},
     year = {1971},
     zbl = {0266.06009},
     url = {http://geodesic.mathdoc.fr/item/CLTM_1971_1971_1_a5/}
}