@article{IIMI_2012_1_a0,
     author = {A. A. Aizikovich and D. S. Kochurova},
     title = {Disconjugacy for a third order linear difference equation},
     journal = {Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta},
     pages = {5--6},
     year = {2012},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IIMI_2012_1_a0/}
}