1. K.L. Smith, B. Holmes and F. Matthew, Asymmetric microporous beads for controlled release, EP 0466986, 1990.
2. Broadest application versus band application of polyolefin-coated fertilizer on green peppers grown;Ombodi;J. Plant Nutr.,2000
3. N. Cosuge and K. Tobataku, Coated granular fertilizers, EP 030331, 1989.
4. Polyethylene-coated urea. 1 Improved storage and handling properties;Salman;Ind. Eng. Chem. Res.,1989
5. Developing a biodegradable film for controlled release of fertilizer;Posey;Plastics Eng.,1994