<a href="http://www.cs.washington.edu/homes/brendan/mkbm/mkbm.html">html</a>, <a href="http://www.cs.washington.edu/homes/brendan/mkbm/mkbm.ps">postscript</a>. (Presented at the 1993 SODA conference.  Also in the Nov-95 SIAM J. of Discrete Mathematics.) </dl>
