@article{GDZPPN002197243,
title = {The 2r-th power character of 2.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {316},
year = {1980},
pages = {174-189},
zbl = {0419.10003},
url = {http://dml.mathdoc.fr/item/GDZPPN002197243}
}
Evans, Ronald J. The 2r-th power character of 2.. Journal für die reine und angewandte Mathematik, Tome 316 (1980) pp. 174-189. http://gdmltest.u-ga.fr/item/GDZPPN002197243/