@article{1989-hafner-pic
,note={URL: {\tt http://links.jstor.org/sici?sici=0894-0347(198910)2:4<837:ARSAFC>2.0.CO;2-D}}
,author={James L. Hafner and Kevin S. McCurley}
,ISSN={0894--0347}
,journal={Journal of the American Mathematical Society}
,MR={91f:11090}
,pages={837--850}
,title={{A rigorous subexponential algorithm for computation of class groups}}
,volume={2}
,year={1989}
}