Voir la notice de l'article provenant de la source Novi sad journal of mathematics website
@article{NSJOM_1992_22_2a_4, author = {Had\v{z}i\'c Olga}, title = {A theorem on best approximations and applications}, journal = {Novi Sad Journal of Mathematics}, pages = {47-55}, publisher = {mathdoc}, volume = {22}, number = {2}, year = {1992}, url = {http://geodesic.mathdoc.fr/item/NSJOM_1992_22_2a_4/} }
Hadžić Olga. A theorem on best approximations and applications. Novi Sad Journal of Mathematics, Tome 22 (1992) no. 2. http://geodesic.mathdoc.fr/item/NSJOM_1992_22_2a_4/