N. RESTREPO, M. M. PATIÑO, T. DIAZ, M. C. TAMAYO, and S. ORDUZ, “Biochemical, immunological and toxicological characteristics of the crystal proteins of Bacillus thuringiensis subsp. medellin”, Rev. Colomb. Entomol., vol. 22, no. 2, pp. 69–75, Jun. 1996.