@article{MO_2015_3_a0,
     author = {O. R. Kayumov and K. E. Kashirina},
     title = {Elementary proof of {Steinharz} hypothesis},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {2--13},
     year = {2015},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2015_3_a0/}
}