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@article{AUPO_1979__18_1_a0, author = {Rach\r{u}nek, Ji\v{r}{\'\i}}, title = {Semi-ordered groups}, journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica}, pages = {5--20}, publisher = {mathdoc}, volume = {18}, number = {1}, year = {1979}, mrnumber = {0589842}, zbl = {0436.06014}, language = {en}, url = {http://geodesic.mathdoc.fr/item/AUPO_1979__18_1_a0/} }
Rachůnek, Jiří. Semi-ordered groups. Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, Tome 18 (1979) no. 1, pp. 5-20. http://geodesic.mathdoc.fr/item/AUPO_1979__18_1_a0/