1. Approximation by Nörlund operators;Chandra;Mat. Vestnik,1986
2. Functions of classes Lp and Lip(α,p) and their Riesz means;Chandra;Riv. Mat. Univ. Parma (4),1986
3. A note on degree of approximation by Nörlund and Riesz operators;Chandra;Mat. Vestnik,1990
4. Some direct and inverse theorems in approximation of functions;Mohapatra;J. Austral. Math. Soc. (Ser. A),1983
5. Error bounds in the approximation of functions;Sahney;Bull. Austral. Math. Soc.,1972