Hoang, N. H., Hien, N. T., Thu Hien, H. T., & Thanh, K. H. (2014). Cloning and expression of keratinase genes in Escherichia coli BL21(DE3) from Bacillus species. Academia Journal of Biology, 35(3se), 51–57. https://doi.org/10.15625/0866-7160/v35n3se.3839