1. P. Dubios, “Plastics in Agriculture”, Appl. Sci. Publ, London, 1978
2. GG. Allan, CS. Chopra, JF. Friedhoff, RI. Gara, NW. Maggi, AN. Neogi, SC. Roberts, RM. Wilkins, Chem Technol 171 (1973)
3. AC. Tanquary, RE. Lacey, eds, “Controlled Release of Biologically Active Agents”, 47, Plenum Press, NY, 1974
4. DR. Paul, FW. Harris, eds, “Controlled Release Polymeric Formulations”, ACS Symp Ser 33, 265–79, Washington DC, 1976
5. N Cardarelli, “Controlled Release Pesticides Formulations”, CRC Press, Boca Raton, FL, 1976