@article{1102969909, author = {Feng, Y. K. and Subbarao, M. V.}, title = {On the density of $(k,\,r)$ integers.}, journal = {Pacific J. Math.}, volume = {39}, number = {3}, year = {1971}, pages = { 613-618}, language = {en}, url = {http://dml.mathdoc.fr/item/1102969909} }
Feng, Y. K.; Subbarao, M. V. On the density of $(k,\,r)$ integers.. Pacific J. Math., Tome 39 (1971) no. 3, pp. 613-618. http://gdmltest.u-ga.fr/item/1102969909/