Voir la notice de l'article provenant de la source Novi sad journal of mathematics website
@article{NSJOM_1987_17_1a_9, author = {Salem A. Sahab and Kahn M. S.}, title = {Some results on best approximation}, journal = {Novi Sad Journal of Mathematics}, pages = {143-152}, publisher = {mathdoc}, volume = {17}, number = {1}, year = {1987}, url = {http://geodesic.mathdoc.fr/item/NSJOM_1987_17_1a_9/} }
Salem A. Sahab; Kahn M. S. Some results on best approximation. Novi Sad Journal of Mathematics, Tome 17 (1987) no. 1. http://geodesic.mathdoc.fr/item/NSJOM_1987_17_1a_9/