TY  - JOUR
AU  - Ladas, G.
TI  - Oscillation in Differential Equations with Positive and Negative Coefficients
JO  - Canadian mathematical bulletin
PY  - 1990
SP  - 442
EP  - 451
VL  - 33
IS  - 4
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1990-072-x/
DO  - 10.4153/CMB-1990-072-x
ID  - 10_4153_CMB_1990_072_x
ER  -