@article{ZNSL_1981_106_a2,
     author = {V. V. Golovizin},
     title = {On the distribution of integer points on hyperbolic surfaces of the second order},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {52--69},
     publisher = {mathdoc},
     volume = {106},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1981_106_a2/}
}