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A. E. Ritchie, D. R. Deshmukh, C. T. Larsen, B. S. Pomeroy, Electron Microscopy of Coronavirus-Like Particles Characteristic of Turkey Bluecomb Disease, Avian Diseases, Vol. 17, No. 3 (Jul. - Sep., 1973), pp. 546-558
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Ritchie et al. (1973) studied this question.
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