TY  - JOUR
AU  - Etgen, Garret J.
AU  - Lewis, Roger T.
TI  - A Hille-Wintner comparison theorem for second order differential systems
JO  - Czechoslovak Mathematical Journal
PY  - 1980
SP  - 98
EP  - 107
VL  - 30
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1980.101659/
DO  - 10.21136/CMJ.1980.101659
LA  - en
ID  - 10_21136_CMJ_1980_101659
ER  -