TY  - JOUR
AU  - Ocalan, Ozkan
TI  - Oscillation of difference equations with variable coefficients.
JO  - Portugaliae mathematica
PY  - 2006
SP  - 407
EP  - 414
VL  - 63
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PORMA_2006__63_4_54015/
LA  - en
ID  - PORMA_2006__63_4_54015
ER  -