13. Reference

• The qwertz Document Type Definition
  Norman Welsh
• SGML-Tools User's Guide 1.0 ($Revision: 1.1.1.1 $)
  Matt Welsh and Greg Hankins and Eric S. Raymond
  November 1997
• Quick SGML Example, v1.0
  Matt Welsh, <mdw@cs.cornell.edu>
  March 1994