S. Arjmand, A. S. Lotfi, M. Shamsara, and S. J. Mowla, “Elevating the expression level of biologically active recombinant human alpha 1-antitrypsin in Pichia pastorisan alpha 1-antitrypsin in Pichia pastoris”, Electron. J. Biotechnol., vol. 16, no. 1, Jan. 2013.