S. C. Uren, N. Ainsworth, S. A. Power, D. A. Cousins, L. M. Huxedrup, M. R. Ashmore, Long-Term Effects of Ammonium Sulphate on Calluna valgaris, Journal of Applied Ecology, Vol. 34, No. 1 (Feb., 1997), pp. 208-216
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Uren et al. (1997) studied this question.