TY  - JOUR
AU  - J. Kisyński
TI  - On operator-valued solutions of d'Alembert's functional equation, I
JO  - Colloquium Mathematicum
PY  - 1971
SP  - 107
EP  - 114
VL  - 23
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/cm-23-1-107-114/
DO  - 10.4064/cm-23-1-107-114
LA  - en
ID  - 10_4064_cm_23_1_107_114
ER  -