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  1. A.G.Oettinger£¬ Autom¨»tic Synt¨»ctic An¨»lys ¨»nd the Pushdown Store £¬ in Proceedings of 12th
  2. Sym-posium of Applied Mathematics£¬ American
  3. Mathema-tical Society£¬ Providence£¬ 1961.