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Johnes, P. J. and Burt, T. P. (1991) Water quality trends in the Windrush catchment: Nitrogen speciation and sediment interactions. Sediment and Stream Water Quality in a Changing Environment, 209. pp. 349-357. ISSN 0144-7815

Robinson, J. S. ORCID: https://orcid.org/0000-0003-1045-4412 and Syers, J. K. (1991) Effects of solution calcium concentration and calcium sink size on the dissolution of Gafsa phosphate rock in soils. European Journal of Soil Science, 42 (3). pp. 389-397. ISSN 1351-0754 doi: https://doi.org/10.1111/j.1365-2389.1991.tb00417.x