@article{DAN_1975_220_4_a4,
     author = {V. V. Laricheva},
     title = {On extension of the averaging interval},
     journal = {Doklady Akademii Nauk},
     pages = {775--778},
     year = {1975},
     volume = {220},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_220_4_a4/}
}