RACHNA BHATERIA, and RAJESH DHANKHAR. “RESPONSE SURFACE METHODOLOGY FOR BIOTRANSFORMATION OF Cr (VI) USING Salmonella Sp. S4”. International Journal of Pharma and Bio Sciences, vol. 5, no. 4, Dec. 2014, pp. 307-19, https://ijpbs.net/index.php/journal/article/view/3751.