@book{1971-norton
,title={{Numbers with small prime factors, and the least $k$th power non-residue}}
,booktitle={{Numbers with small prime factors, and the least $k$th power non-residue}}
,author={Karl K. Norton}
,MR={44:3948}
,publisher={American Mathematical Society}
,address={Providence, Rhode Island}
,year={1971}
}