by Penn, J.S., Madan, A., Caldwell, R.B., Bartoli, M., Caldwell, R.W., Hartnett, M.E.
Published in Progress in retinal and eye research (01.07.2008)

by Shortle, J.S. (Penn State.)
Published in Farm economics (University Park, Pa.) (USA) (01.05.1995)

by Penn, J.S. (Cullen Eye Institute, Houston, TX), Thum, L.A
Published in Annals of the New York Academy of Sciences (01.12.1989)

by Kommonen, B. (Veterinaerhoegskolan, Helsingfors (Finland). Dept. of Surgery), Penn, J.S, Kylmae, T, Karhunen, U, Ukkola, T, Tolman, B
Year of Publication 1995