TY - JOUR AU - Taylor, W.E. jr. TI - Oscillation properties of fourth order difference equations JO - Portugaliae mathematica PY - 1988 SP - 105 EP - 114 VL - 45 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/PORMA_1988__45_1_115614/ LA - en ID - PORMA_1988__45_1_115614 ER -