Zhang, X., B. Lin, X. Gao, and H. Shen. “Enhancement of Wanlongmycin Production by Nitrogen Ion Beam Implantation”. Electronic Journal of Biotechnology, vol. 13, no. 1, Jan. 2010, pp. 0-0, https://preprints.pucv.cl/index.php/ejbiotechnology/article/view/v13n1-9.