@article{PORMA_1988__45_3_115627,
     author = {Smith, B.},
     title = {Oscillation and nonoscillation theorems for third order quasi-adjoint difference equations},
     journal = {Portugaliae mathematica},
     pages = {229--243},
     publisher = {mathdoc},
     volume = {45},
     number = {3},
     year = {1988},
     mrnumber = {0973159},
     zbl = {0665.39002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1988__45_3_115627/}
}