1. Graham-Bryce, I J and Briggs G G, R I C Reviews, 1970, 2, 87.
2. Taschenberg, E F, Mack, G L and Gambrell, F L, J. agric. Fd Chem 1961, 9, 207.
3. Hirst, J M, LeRiche, H H and Bascombe, C L, Plant Path., 1961, 10, 105.
4. Raw, F, Rep. Rothamsted exp. sta., 1961, p146 and 1962, p158.
5. Kearney, P C, Nash, R G, and Isensee, A R in Chemical Fallout: Current Research on Persistent Pesticides ed. M W Miller and G C Berg, Chap. 3, pp54–67, Springfield, Ill Charles C Thomas, 1969.