D. D. Bhagat and P. R. Dudhagara and Piyush V. Desai, “STATISTICAL APPROACH FOR PECTINASE PRODUCTION BY Bacillus firmus SDB9 AND EVALUATION OF PECTINO-XYLANOLYTIC ENZYMES FOR PRETREATMENT OF KRAFT PULP”, J microb biotech food sci, vol. 5, no. 5, pp. 396–406, Apr. 2016.