@article{120038, author = {Jaroslava Jachanov\'a and Helena \v Z\'akov\'a}, title = {On a dependence between polarities and an order of a projective plane}, journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica}, volume = {15}, year = {1976}, pages = {29-33}, zbl = {0371.50013}, mrnumber = {0640740}, language = {en}, url = {http://dml.mathdoc.fr/item/120038} }
Jachanová, Jaroslava; Žáková, Helena. On a dependence between polarities and an order of a projective plane. Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, Tome 15 (1976) pp. 29-33. http://gdmltest.u-ga.fr/item/120038/
The infinity of generalized hyperbolic plаnes, From "Studies аnd Essаys presented to Richаrd Courаnt on his 60th Birthdаy", New York 1948, pp. 21-27. (1948) | MR 0023083
Polarities in finite projective plаnes, Bull. Amer. Mаth. Soc. 52 (1946), pp. 77-93. (1946) | MR 0015219