TY  - JOUR
AU  - Smith, B.
TI  - Oscillation and nonoscillation theorems for third order quasi-adjoint difference equations
JO  - Portugaliae mathematica
PY  - 1988
SP  - 229
EP  - 243
VL  - 45
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PORMA_1988__45_3_115627/
LA  - en
ID  - PORMA_1988__45_3_115627
ER  -