by Irwin, V. L., Traub-Dargatz, J. L., Newton, J. R., Scase, T. J., Davis-Poynter, N. J., Nugent, J., Creis, L., Leaman, T. R., Smith, K. C.
Published in Veterinary record (17.03.2007)

by Solka, J.L., Marchette, D.J., Wallet, B.C., Irwin, V.L., Rogers, G.W.
Published in IEEE transactions on pattern analysis and machine intelligence (01.08.1998)