Nguyen, N., L. Huynh, and T. Ha. “Optimizing the Parameters of Manure Scraper Equipment in Cow Milk Dairy Farm by the Manure Scraper Model”. Science and Technology Development Journal, Vol. 20, no. K6, Oct. 2017, pp. 35-42, doi:https://doi.org/10.32508/stdj.v20iK6.1169.