@article{AA_2002_14_3_a6,
     author = {S. N. Naboko and J. Janas},
     title = {Criteria for semiboundedness in a~class of unbounded {Jacobi} operators},
     journal = {Algebra i analiz},
     pages = {158--168},
     publisher = {mathdoc},
     volume = {14},
     number = {3},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2002_14_3_a6/}
}