@article{VMUMM_2019_5_a2,
     author = {V. V. Bykov},
     title = {To {Millionshchikov's} problem on the baire class of central exponents of diffeomorphisms},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {17--22},
     year = {2019},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2019_5_a2/}
}