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Dudley M, Johnson AL, Olmstead M, Smith CW, Schaeffer DJ, Abbuehl U.Dudley M, et al. Among authors: schaeffer dj.J Am Vet Med Assoc. 1997 Oct 15;211(8):1008-12.J Am Vet Med Assoc. 1997.PMID: 9343545
Johnson JM, Johnson AL, Pijanowski GJ, Kneller SK, Schaeffer DJ, Eurell JA, Smith CW, Swan KS.Johnson JM, et al. Among authors: schaeffer dj.Am J Vet Res. 1997 Dec;58(12):1473-8.Am J Vet Res. 1997.PMID: 9401702
Johnson AL, Smith CW, Schaeffer DJ.Johnson AL, et al. Among authors: schaeffer dj.J Am Vet Med Assoc. 1998 Oct 15;213(8):1157-61.J Am Vet Med Assoc. 1998.PMID: 9787384