J. Gelb, Jr., B. E. Perkins, J. K. Rosenberger, P. H. Allen, Serologic and Cross-Protection Studies with Several Infectious Bronchitis Virus Isolates from Delmarva-Reared Broiler Chickens, Avian Diseases, Vol. 25, No. 3 (Jul. - Sep., 1981), pp. 655-666
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Gelb et al. (1981) studied this question.