@article{GDZPPN002402203,
title = {Multiplicative Twins and Primitive Roots.},
journal = {Mathematische Zeitschrift},
volume = {105},
year = {1968},
pages = {49-58},
zbl = {0165.05704},
url = {http://dml.mathdoc.fr/item/GDZPPN002402203}
}
Bernstein, Leon. Multiplicative Twins and Primitive Roots.. Mathematische Zeitschrift, Tome 105 (1968) pp. 49-58. http://gdmltest.u-ga.fr/item/GDZPPN002402203/