References
- Babu , S. P. , ed. 1975 . Trace Elements in Fuel , Advances in chemistry series 1 – 216 . Wash. D.C. : American Chem. Soc. .
- Lee , R. E. , Crist , H. L. , Riley , A. E. and MacLeod , K. E. 1975 . Environ. Sci. and Tech. , 9 : 643 – 647 .
- Townsend , W. N. and Gillham , E. W. F. 1975 . 15th Symposium of British Ecology Society . 1975 . Edited by: Chadwick , M. F. and Goodman , G. T.
- Wallace , A. , Mueller , R. T. , Patel , P. M. and Soufi , S. M. 1976 . Comm. Soil Sci. Plant Analysis , 7 : 57 – 60 .
- Wallace , A. , Romney , E. M. and Alexander , G. V. 1977 . Comm. Soil Sci. Plant Analysis , 8 (9) : 713 – 718 .