Rebhun, W. C., S. L. Fubini, C. Cable, S. F. Peek, and N. G. Ducharme. “Presurgical Diagnosis of Abomasal Displacement and Perforation”. The Bovine Practitioner, vol. 1996, no. 30, May 1996, pp. 75-78, doi:10.21423/bovine-vol1996no30p75-78.