Azadi, Saeed, et al. “Improvements in the Downstream Processing of RhGH Production in Pichia Pastoris: Optimization of HGH Purification Using Activated Carbon Clarification in Pichia Pastoris”. Iranian Journal of Pharmaceutical Sciences, vol. 14, no. 3, July 2018, pp. 67-73, doi:10.22037/ijps.v14.40639.