On Existence of Finite Universal Korovkin Sets in the Centre of Group Algebras. M.R., Tewari, U.B. Agrawal — 1997 Monatshefte für Mathematik
Tensor products of commutative Banach algebras. Tewari, U.B.; Dutta, M.; Madan, Shobha — 1982 International Journal of Mathematics and Mathematical Sciences