@article{1949-buchstab
,author={Aleksandr A. Buchstab}
,ISSN={0002--3264}
,journal={Doklady Akademii Nauk SSSR}
,MR={11,84b}
,pages={5--8}
,title={{On those numbers in an arithmetic progression all prime factors of which are small in order of magnitude}}
,volume={67}
,year={1949}
}