Martin Müller, 
   Joachim Niehren and 
   Ralf Treinen. The First-Order Theory of Ordering Constraints over Feature Trees.  In 13th Annual IEEE Symposium on Logic in Computer Sience (LICS '98), June 21 - 24, Pages 432-443, IEEE Press, Indianapolis, Indiana, USA,   1998.   [Abstract]      google  [Annote]
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