 <strong> The abstracts (or more precisely the cover pages) are classified into subjects. Each subject represents  a file containing 1-7 abstracts of articles on that subject. Articles completed after 1990 are available for anonymous ftp. Present site is  <A HREF="ftp://ftp.cs.wisc.edu/Approx"> <TT>ftp.cs.wisc.edu</TT></A>.  <P>
