@article{DM_2006_18_4_a1,
     author = {G. I. Arkhipov and V. N. Chubarikov},
     title = {Asymptotic formula for the number of points of a~lattice in the circle on the {Lobachevsky} plane},
     journal = {Diskretnaya Matematika},
     pages = {9--17},
     publisher = {mathdoc},
     volume = {18},
     number = {4},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_2006_18_4_a1/}
}