@article{1250127235,
author = {Subbarao, M.V. and Prasad, V. Siva Rama},
title = {Some analogues of a Lehmer problem on the totient function},
journal = {Rocky Mountain J. Math.},
volume = {15},
number = {4},
year = {1985},
pages = { 609-620},
language = {en},
url = {http://dml.mathdoc.fr/item/1250127235}
}
Subbarao, M.V.; Prasad, V. Siva Rama. Some analogues of a Lehmer problem on the totient function. Rocky Mountain J. Math., Tome 15 (1985) no. 4, pp. 609-620. http://gdmltest.u-ga.fr/item/1250127235/