TY - JOUR AU - Harshinder Singh AU - H.L. Vasudeva TI - Exponential-cosine operator-valued functional equation in the strong operator topology. JO - Aequationes mathematicae PY - 1984 SP - 187 EP - 197 VL - 27 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/AM2_1984__27_137021/ ID - AM2_1984__27_137021 ER -