TY  - JOUR
AU  - Chen, Lu-San
TI  - A Lyapunov inequality and forced oscillations in general nonlinear nth order differential-difference equations†
JO  - Glasgow mathematical journal
PY  - 1977
SP  - 161
EP  - 166
VL  - 18
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.1017/S0017089500003219/
DO  - 10.1017/S0017089500003219
ID  - 10_1017_S0017089500003219
ER  -