Thomas R. Klei, Betty J. Torbert, Ricardo Ochoa, Efficacy of Ivermectin (22,23-dihydroavermectin B1) against Adult Setaria equina and Microfilariae of Onchocerca cervicalis in Ponies, The Journal of Parasitology, Vol. 66, No. 5 (Oct., 1980), pp. 859-861
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Klei et al. (1980) studied this question.