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@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}, publisher = {mathdoc}, volume = {5}, year = {1971}, zbl = {0266.04002}, url = {http://geodesic.mathdoc.fr/item/RCM_1971__5_181584/} }
Hartwig Fuchs. Algorithmic representations of Wermus' constructions of ordinal numbers. Revista colombiana de matematicas, Tome 5 (1971), pp. 10-16. http://geodesic.mathdoc.fr/item/RCM_1971__5_181584/