@article{VMUMM_2009_1_a12,
     author = {D. V. Goryashin},
     title = {Summation of the {Euler} function values over numbers of the form $p-1$},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {63--65},
     publisher = {mathdoc},
     number = {1},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2009_1_a12/}
}