@book{1991-petho
,title={{Computational number theory}}
,booktitle={{Computational number theory}}
,author={Attila Petho and Michael E. Pohst and Hugh C. Williams and Horst G. Zimmer}
,ISBN={3--11--012394--0}
,MR={92i:11131}
,publisher={Walter de Gruyter}
,address={Berlin}
,year={1991}
}