J. P. Michaud, Numerical Response of Olla v-nigrum (Coleoptera: Coccinellidae) to Infestations of Asian Citrus Psyllid, (Hemiptera: Psyllidae) in Florida, The Florida Entomologist, Vol. 84, No. 4 (Dec., 2001), pp. 608-612
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J. P. Michaud (2001) studied this question.