Indian Journal of Pure and Applied Mathematics (Indian J. Pure Appl. Math.) (20020101), 33, no.~11, 1635-1641. ISSN: 0019-5588 (print).eISSN: 0975-7465.
Indian Journal of Pure and Applied Mathematics (Indian J. Pure Appl. Math.) (20010101), 32, no.~8, 1145-1151. ISSN: 0019-5588 (print).eISSN: 0975-7465.