@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/