Barton, J.E., A.R. Weinhold, M.N. Schroth. 1981.

Barton, J.E., A.R. Weinhold, M.N. Schroth. 1980.

Mulrean, E.N., M.N. Schroth, G.S. Sibbett, B. Teviotdale, B. Olson, L. Fitch, J. Barton, A.H. McCain. 1980.

Robb, E.M., A.R. Weinhold, M.N. Schroth, J. Barton. 1979.