Costas B. Krimbas, Spyros Tsakas, The Genetics of Dacus oleae. V. Changes of Esterase Polymorphism in a Natural Population Following Insecticide Control-Selection or Drift?, Evolution, Vol. 25, No. 3 (Sep., 1971), pp. 454-460
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Krimbas et al. (1971) studied this question.