http://www.cs.ucsd.edu/users/bsy/dobbertin.ps is a copy of the PostScript file. -------- Bennet S. Yee Phone: +1 619 534 4614 Email: bsy@cs.ucsd.edu Web: http://www-cse.ucsd.edu/users/bsy/ USPS: Dept of Comp Sci and Eng, 0114, UC San Diego, La Jolla, CA 92093-0114