Park, I., and J. Cho. “Production of an Extracellular Protease by an Antarctic Bacterial Isolate (Bacillus Sp. JSP1) As a Potential Feed Additive”. Revista Colombiana De Ciencias Pecuarias, vol. 24, no. 1, Apr. 2011, pp. 3-10, doi:10.17533/udea.rccp.324625.