1. Fraser and Hamada, Proc. Roy. Soc. Edin., B, 44, 462 (1952).
2. Waddington, Quinquennial Report 1947–1951 of the Institute of Animal Genetics, University of Edinburgh (1952).
3. Dry, J. Text. Inst., 24, T161 (1933).
4. Dry, N.Z. J. Agric., 48, 331 (1934).
5. Dry, N.Z. Sci. Rev., 5, 69 (1952).