\bib{1955/chowla}
\yr 1955
\mr 17,127l
\by Sarvadaman D. Chowla
\by William E. Briggs
\paper On the number of positive integers $\le x$ all of whose prime factors are $\le y$
\jour Proceedings of the American Mathematical Society
\issn 0002--9939
\vol 6
\pages 558--562
\endref