@article{PORMA_1992__49_2_115788,
     author = {Popenda, J. and Schmeidel, E.},
     title = {Nonoscillatory solutions of third order difference equations},
     journal = {Portugaliae mathematica},
     pages = {233--239},
     publisher = {mathdoc},
     volume = {49},
     number = {2},
     year = {1992},
     mrnumber = {1201975},
     zbl = {0778.39003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1992__49_2_115788/}
}