Namipashaki, Atefeh, et al. “Development of a Semi-Quantitative Multiplex PCR Method for Detecting Residual Pichia Pastoris Host Cell DNA in Biopharmaceuticals”. Trends in Peptide and Protein Sciences, vol. 1, no. 2, Jan. 2017, pp. 61-67, doi:10.22037/tpps.v1i2.15107.