Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{PORMA_1972__31_1_115158, author = {Suryanarayana, D.}, title = {Two arithmetic functions and asymptotic densities of related sets}, journal = {Portugaliae mathematica}, pages = {1--11}, publisher = {mathdoc}, volume = {31}, number = {1}, year = {1972}, mrnumber = {0302550}, zbl = {0236.10025}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1972__31_1_115158/} }
Suryanarayana, D. Two arithmetic functions and asymptotic densities of related sets. Portugaliae mathematica, Tome 31 (1972) no. 1, pp. 1-11. http://geodesic.mathdoc.fr/item/PORMA_1972__31_1_115158/