@article{EMJ_2018_9_2_a9,
     author = {K. N. Ospanov},
     title = {Discreteness and estimates of spectrum of a first order difference operator},
     journal = {Eurasian mathematical journal},
     pages = {89--94},
     publisher = {mathdoc},
     volume = {9},
     number = {2},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EMJ_2018_9_2_a9/}
}