[1]
D. L. Step, A. W. Confer, J. G. Kirkpatrick, J. B. Richards, R. W. Fulton, and M. E. Payton, “Respiratory tract infections in dairy calves from birth to breeding age: Detection by laboratory isolation and antibody responses”, Bov. pract., vol. 39, no. 1, pp. 44–53, Feb. 2005.