@article{PIM_1989_N_S_45_59_a14,
     author = {P.N. Agrawal and Vijay Gupta and Ashok Sahai},
     title = {On {Convergence} of {Derivatives} of {Linear} {Combinations} of {Modified} {Lupas} {Operators}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {95 },
     publisher = {mathdoc},
     volume = {_N_S_45},
     number = {59},
     year = {1989},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1989_N_S_45_59_a14/}
}