@article{GDZPPN002353059,
title = {3 as a Ninth Power (mod p).},
journal = {Mathematica Scandinavica},
volume = {34},
year = {1974},
pages = {309-317},
zbl = {0297.10002},
url = {http://dml.mathdoc.fr/item/GDZPPN002353059}
}
Williams, Kenneth S. 3 as a Ninth Power (mod p).. Mathematica Scandinavica, Tome 34 (1974) pp. 309-317. http://gdmltest.u-ga.fr/item/GDZPPN002353059/