@article{RCM_1971__5_181584,
     author = {Hartwig Fuchs},
     title = {Algorithmic representations of {Wermus'} constructions of ordinal numbers},
     journal = {Revista colombiana de matematicas},
     pages = {10--16},
     year = {1971},
     volume = {5},
     zbl = {0266.04002},
     url = {http://geodesic.mathdoc.fr/item/RCM_1971__5_181584/}
}