@article{119951, author = {Jaroslava Jachanov\'a}, title = {On permutable quadratic inversions in plane with two common singular points}, journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica}, volume = {11}, year = {1971}, pages = {29-36}, zbl = {0272.50016}, mrnumber = {0333943}, language = {en}, url = {http://dml.mathdoc.fr/item/119951} }
Jachanová, Jaroslava. On permutable quadratic inversions in plane with two common singular points. Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, Tome 11 (1971) pp. 29-36. http://gdmltest.u-ga.fr/item/119951/
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