1.Communications in Soil Science and Plant Analysis
Volume 15, Issue 3, 1984
Bray/Kurtz, Mehlich III, AB/D and ammonium acetate extractions of P, K and MG in four oklahoma soils
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http://dx.doi.org/10.1080/00103628409367475Correlation of Mehlich 3, bray 1, and ammonium acetate extractable P, K, Ca, and Mg for Alaska agricultural soils
Volume 18, Issue 9, 1987
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http://dx.doi.org/10.1080/00103628709367877