@article{MZM_2006_80_3_a18,
     author = {D. A. Mit'kin},
     title = {Estimates of certain arithmetic sums related to the number of divisors},
     journal = {Matemati\v{c}eskie zametki},
     pages = {471--472},
     publisher = {mathdoc},
     volume = {80},
     number = {3},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2006_80_3_a18/}
}