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@article{10_21136_MB_1993_126020, author = {Jakub{\'\i}k, J\'an}, title = {On directed groups with additional operations}, journal = {Mathematica Bohemica}, pages = {11--17}, publisher = {mathdoc}, volume = {118}, number = {1}, year = {1993}, doi = {10.21136/MB.1993.126020}, mrnumber = {1213828}, zbl = {0799.06027}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.1993.126020/} }
Jakubík, Ján. On directed groups with additional operations. Mathematica Bohemica, Tome 118 (1993) no. 1, pp. 11-17. doi : 10.21136/MB.1993.126020. http://geodesic.mathdoc.fr/articles/10.21136/MB.1993.126020/
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