K. L. Heddleston, J. E. Gallagher, P. A. Rebers, Fowl Cholera: Gel Diffusion Precipitin Test for Serotyping Pasteurella multocida from Avian Species, Avian Diseases, Vol. 16, No. 4 (Jul. - Sep., 1972), pp. 925-936
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Heddleston et al. (1972) studied this question.