@article{04109295,
title = {On convergence of derivatives of linear combinations of modified Lupas operators.},
journal = {Publications de l'Institut Math\'ematique. Nouvelle S\'erie},
volume = {46(60)},
year = {1989},
pages = {95-102},
zbl = {0677.41019},
language = {en},
url = {http://dml.mathdoc.fr/item/04109295}
}
Agrawal, P.N.; Gupta, Vijay; Sahai, A. On convergence of derivatives of linear combinations of modified Lupas operators.. Publications de l'Institut Mathématique. Nouvelle Série, Tome 46(60) (1989) pp. 95-102. http://gdmltest.u-ga.fr/item/04109295/