@article{104663, author = {Old\v rich Kope\v cek}, title = {Die arithmetischen Operationen f\"ur geordnete Mengen}, journal = {Archivum Mathematicum}, volume = {004}, year = {1968}, pages = {157-174}, zbl = {0211.02803}, mrnumber = {0269555}, language = {de}, url = {http://dml.mathdoc.fr/item/104663} }
Kopeček, Oldřich. Die arithmetischen Operationen für geordnete Mengen. Archivum Mathematicum, Tome 004 (1968) pp. 157-174. http://gdmltest.u-ga.fr/item/104663/
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