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C. N. Burke, R. E. Luginbuhl, The Effect of Parameter Selection in Evaluation of Infectious Bronchitis Virus Vaccine. I. Evaluation of the Connecticut Strain by Virus Recovery Tests, Avian Diseases, Vol. 16, No. 3 (May - Jun., 1972), pp. 467-480
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Burke et al. (1972) studied this question.
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