TY  - JOUR
AU  - Yu. I. Zubko
AU  - V. A. Tyshkevich
TI  - On the question of the positivity of a Cauchy function
JO  - Differencialʹnye uravneniâ
PY  - 1973
SP  - 1207
EP  - 1213
VL  - 9
IS  - 7
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1973_9_7_a4/
LA  - ru
ID  - DE_1973_9_7_a4
ER  -