\bib{1989/hafner-pic}
\yr 1989
\mr 91f:11090
\by James L. Hafner
\by Kevin S. McCurley
\paper A rigorous subexponential algorithm for computation of class groups
\jour Journal of the American Mathematical Society
\issn 0894--0347
\vol 2
\pages 837--850
\url http://links.jstor.org/sici?sici=0894-0347(198910)2:4<837:ARSAFC>2.0.CO;2-D
\endref