Voir la notice de l'article provenant de la source Novi sad journal of mathematics website
@article{NSJOM_1999_29_3a_20, author = {R. Obradovi\'c}, title = {Surface - surface intersection: {Auxiliary} spheres}, journal = {Novi Sad Journal of Mathematics}, pages = {221-230}, publisher = {mathdoc}, volume = {29}, number = {3}, year = {1999}, url = {http://geodesic.mathdoc.fr/item/NSJOM_1999_29_3a_20/} }
R. Obradović. Surface - surface intersection: Auxiliary spheres. Novi Sad Journal of Mathematics, Tome 29 (1999) no. 3. http://geodesic.mathdoc.fr/item/NSJOM_1999_29_3a_20/