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Dimitr S. Todorovsky, Natalia L. Minkova and Dariena P. Bakalova
Effect of the application of superphosphate on rare earths' content in the soil
Science of The Total Environment
Volume 203, Issue 1, 29 August 1997, Pages 13-16
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http://dx.doi.org/10.1016/S0048-9697(97)00131-9Zhengyi Hua, Silvia Haneklaus, Gerd Sparovekc, Ewald Schnug
Communications in Soil Science and Plant Analysis
Volume 37, Issue 9-10, 2006
Rare Earth Elements in Soils
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http://dx.doi.org/10.1080/00103620600628680