TY  - JOUR
AU  - E. LUKACS
TI  - Non Negative Definite Solutions of Certain Differential and Functional Equations (Short Communication)
JO  - Aequationes mathematicae
PY  - 1969
SP  - 128
EP  - 128
VL  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AM2_1969__2_182312/
ID  - AM2_1969__2_182312
ER  -