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  1.  13
    Unrestricted classification behavior and learning of imposed classifications in closed, exhaustive stimulus sets.Bert Zippel - 1969 - Journal of Experimental Psychology 82 (3):493.
  2.  20
    Classification and learning of distributed stimulus sets.Bert Zippel & Joseph Karpienia - 1980 - Bulletin of the Psychonomic Society 15 (2):109-111.
  3.  12
    Free association within categories as a function of typicality.Bert Zippel - 1979 - Bulletin of the Psychonomic Society 14 (6):445-446.
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  4.  16
    Recall of accessible items from memory as a function of executive instructions, delay tasks, and serial position.Bert Zippel - 1980 - Bulletin of the Psychonomic Society 15 (1):45-47.