Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{MASLO_1965__15_1_a5, author = {Urban, Alois}, title = {Element\'arn{\'\i} prostorov\'e ur\v{c}en{\'\i} oskula\v{c}n{\'\i}ch kru\v{z}nic ku\v{z}elose\v{c}ek {I}}, journal = {Mathematica slovaca}, pages = {73--80}, publisher = {mathdoc}, volume = {15}, number = {1}, year = {1965}, zbl = {0132.15201}, language = {cz}, url = {http://geodesic.mathdoc.fr/item/MASLO_1965__15_1_a5/} }
Urban, Alois. Elementární prostorové určení oskulačních kružnic kuželoseček I. Mathematica slovaca, Tome 15 (1965) no. 1, pp. 73-80. http://geodesic.mathdoc.fr/item/MASLO_1965__15_1_a5/