%0 Journal Article
%A Morgado, José
%T A property of the Euler $\varphi $-function concerning the integers which are regular modulo n
%J Portugaliae mathematica
%D 1974
%P 185-191
%V 33
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/PORMA_1974__33_4_115237/
%G en
%F PORMA_1974__33_4_115237