Voir la notice de l'article provenant de la source Mathematicac Balkanica website
@article{MABA_1991_5_2_a2, author = {S. M. Mazhar}, title = {Approximation by {Positive} {Operators} of {Infinite} {Intervals}}, journal = {Mathematica balkanica}, pages = {99}, publisher = {mathdoc}, volume = {5}, number = {2}, year = {1991}, url = {http://geodesic.mathdoc.fr/item/MABA_1991_5_2_a2/} }
S. M. Mazhar. Approximation by Positive Operators of Infinite Intervals. Mathematica balkanica, Tome 5 (1991) no. 2, p. 99. http://geodesic.mathdoc.fr/item/MABA_1991_5_2_a2/