Shumaila Butt, Sikander Ali and Ikram-ul-Haq. “MUTATION OF CEPHALOSPORIUM ACREMONIUM NRRL-2443 THROUGH UVIRRADIATION FOR CEPHALOSPORIN-C PRODUCTION”. Pakistan Journal of Biotechnology, vol. 4, no. (1-2), Mar. 2021, pp. 41-46, https://pjbt.org/index.php/pjbt/article/view/197.