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1. A Needed Narrowing Strategy
   Sergio Antoy, Rachid Echahed, and Michael Hanus
   In: Proceedings of the 21st ACM Symposium on Principles of Programming Languages (POPL'94), Portland, USA, 1994, 1994, 268-279. Note: Extended version available as Research Report MPI-I-93-243, Max-Planck-Institut für Informatik, Saarbrücken, Germany