Bernard, Ndayambaje Jean, et al. “Integration of GC-MS in Identification of Possible Final Metabolites from Phytase Production in Pichia Pastoris Based on Sorbitol Induction Optimization ”. Archives of Biotechnology and Biomedicine, vol. 5, no. 1, Apr. 2021, pp. 020-5, doi:10.29328/journal.abb.1001024.