@article{FPM_2005_11_6_a9,
     author = {Yu. V. Malykhin},
     title = {Bounds for exponential sums modulo~$p^2$},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {81--94},
     publisher = {mathdoc},
     volume = {11},
     number = {6},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2005_11_6_a9/}
}