@article{ZNSL_1979_91_a5,
     author = {V. N. Popov},
     title = {Asymptotic formula for the sum of sums of the elements of continued fractions for the numbers $a/p$},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {81--93},
     publisher = {mathdoc},
     volume = {91},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1979_91_a5/}
}