@article{AA_2021_33_1_a5,
     author = {B. M. Makarov and A. N. Podkorytov},
     title = {On the exactness of conditions in the {Federer} theorem},
     journal = {Algebra i analiz},
     pages = {119--135},
     year = {2021},
     volume = {33},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2021_33_1_a5/}
}