Martin Müller and 
   Joachim Niehren. Ordering Constraints over Feature Trees Expressed in Second-Order Monadic Logic.  In 
   T. Nipkow editor,  9th International Conference on Rewriting Techniques and Applications (RTA '98), March 30 - April 1, (1379):196-210, Springer-Verlag, Tsukuba, Japan,   1998.   [Abstract]      google  [Annote]
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