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![](./images/clear.gif) 1.- A SLOW-RELEASE K (SUPER +) FERTILIZER FROM RESIDUES OF THE BRAZILIAN OIL-SHALE INDUSTRY; SYNTHESIS OF KALSILITE-TYPE STRUCTURES
SPRINGER INTERNATIONAL; BERLIN; DEU; FEDERAL REPUBLIC OF GERMANY, 2001
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![](./images/clear.gif) 2.- SOIL MANAGEMENT SYSTEM EFFECTS ON SIZE FRACTIONATED HUMIC SUBSTANCES
ELSEVIER; AMSTERDAM; NLD; NETHERLANDS, 1999
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