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Isobolograms illustrating the synergism between (A) sulphadimidine and pyrimethamine (Kendall and Joyner, 1956; ©Elsevier) and (B) clopidol and methyl benzoquate (Joyner and Norton, 1978; ©Cambridge University Press). Data for E. tenella and E. maxima respectively. Reproduced with permission.
