@article{ZNSL_2005_322_a4,
     author = {P. Ding},
     title = {On an exponential sum},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {63--75},
     publisher = {mathdoc},
     volume = {322},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2005_322_a4/}
}