Li, S., W. Huang, J. Chang, P. Wang, Q. Yin, C. Liu, E. Wang, and F. Lu. “Xylanase Gene Mutation by Error-Prone Pcr and Expression in Pichia Pastoris”. Bioscience Journal, vol. 34, no. 3, May 2018, pp. 769-77, doi:10.14393/BJ-v34n3a2018-38530.