TY  - JOUR
AU  - S. Czerwik
TI  - On sign-preserving solutions of a linear functional equation
JO  - Annales Polonici Mathematici
PY  - 1968
SP  - 73
EP  - 79
VL  - 20
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/ap-20-1-73-79/
DO  - 10.4064/ap-20-1-73-79
LA  - en
ID  - 10_4064_ap_20_1_73_79
ER  -