1. Approved Methods of Analysis;AACC International,2000
2. Neutral Detergent Fiber in Feeds and Acid Detergent Fiber in Feeds;ANKOM Tech Methods,1995
3. Official Methods of Analysis of AOAC International;AOAC,2012
4. Official Methods and Recommended Practices of the AOCS;AOCS,1998
5. Protease increases fermentation rate and ethanol yield in dry-grind ethanol production;Johnston;Bioresour. Technol.,2014