@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/}
}