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 Ver registro 2.- SOIL MANAGEMENT SYSTEM EFFECTS ON SIZE FRACTIONATED HUMIC SUBSTANCES ELSEVIER; AMSTERDAM; NLD; NETHERLANDS, 1999 Ver registro
