@article{UFA_2017_9_3_a8,
     author = {A. S. Krivosheev and A. F. Kuzhaev},
     title = {On one {Leontiev-Levin} theorem},
     journal = {Ufa mathematical journal},
     pages = {87--99},
     year = {2017},
     volume = {9},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UFA_2017_9_3_a8/}
}