@article{oai:tsukuba.repo.nii.ac.jp:00017292,
 author = {Mikawa, Hiroshi},
 issue = {2},
 journal = {Tsukuba Journal of Mathematics},
 month = {Dec},
 pages = {351--360},
 title = {On exponential sums over primes in arithmetic progressions},
 volume = {24},
 year = {2000}
}