@article{1103038049,
author = {Ankeny, N. C.},
title = {Criterion for $r$th power residuacity.},
journal = {Pacific J. Math.},
volume = {10},
number = {4},
year = {1960},
pages = { 1115-1124},
language = {en},
url = {http://dml.mathdoc.fr/item/1103038049}
}
Ankeny, N. C. Criterion for $r$th power residuacity.. Pacific J. Math., Tome 10 (1960) no. 4, pp. 1115-1124. http://gdmltest.u-ga.fr/item/1103038049/