@article{LJM_2004_16_a2,
     author = {A. A. Kuznetsov},
     title = {On a~problem of {Avhadiev}},
     journal = {Lobachevskii journal of mathematics},
     pages = {57--69},
     year = {2004},
     volume = {16},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/LJM_2004_16_a2/}
}