@article{PORMA_1990__47_3_115719,
     author = {Alling, Norman L. and Swartz, Timothy A.},
     title = {Monomorphisms of inductive number systems},
     journal = {Portugaliae mathematica},
     pages = {293--308},
     publisher = {mathdoc},
     volume = {47},
     number = {3},
     year = {1990},
     mrnumber = {1090269},
     zbl = {0728.12012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1990__47_3_115719/}
}