@article{IIMI_2019_54_a2,
     author = {A. E. Lipin},
     title = {On a problem related to second-order {Diophantine} equations},
     journal = {Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta},
     pages = {38--44},
     publisher = {mathdoc},
     volume = {54},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IIMI_2019_54_a2/}
}