›› 1989, Vol. 32 ›› Issue (4): 492-500.doi:

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AN OVERVIEW ON THE CONCEPTION OF ECONOMIC THRESHOLD

SHENG CHENG-FA   

  1. Institute of Zoology, Academia Sinica, Beijing
  • Online:1989-10-15 Published:1989-10-15

Key words: economic threshold, yie ld loss assessment, pes control