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Jefferson RA et al. Genetic Use Restriction TechnologiesArchived 2014-02-05 at the Wayback Machine: Technical Assessment of the Set of New Technologies which Sterilize or Reduce the Agronomic Value of Second Generation Seed, as Exemplified by U.S. Patent No. 5,723,765, and WO 94/03619. Expert paper, prepared for the Secretariat on 30 April 1999