@article{ZNSL_1980_93_a5,
     author = {U. M. Pachev},
     title = {On the distribution of integer points on some parted hyperboloid},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {87--141},
     publisher = {mathdoc},
     volume = {93},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1980_93_a5/}
}