@article{120071, author = {Ji\v r\'\i\ Rach\r unek}, title = {Semi-ordered groups}, journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica}, volume = {18}, year = {1979}, pages = {5-20}, zbl = {0436.06014}, mrnumber = {0589842}, language = {en}, url = {http://dml.mathdoc.fr/item/120071} }
Rachůnek, Jiří. Semi-ordered groups. Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, Tome 18 (1979) pp. 5-20. http://gdmltest.u-ga.fr/item/120071/
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