The generalized Cauchy equation for operator-valued functions. H.L. Vasudeva; A.B. Buche — 1976 Aequationes mathematicae
The generalized Cauchy equation for operator-valued functions. (Short Communication). H.L. Vasudeva; A.B. Buche — 1975 Aequationes mathematicae
On Jensen's functional equation. (Summary). H.L. Vasudeva; J.C. Parnami — 1992 Aequationes mathematicae
Exponential-cosine operator-valued functional equation in the strong operator topology. Harshinder Singh; H.L. Vasudeva — 1984 Aequationes mathematicae
A comparative study of functional equations characterising sine and cosine. H.L. Vasudeva; J.C. Parnami — 1986 Aequationes mathematicae