Hunt, Chris L., Donald M. Johnson, and Don W. Edgar. “NOX Emissions and Performance of a Compact Diesel Tractor Fueled With Emulsified and Non-Emulsified Biodiesel”. Journal of Agricultural Systems, Technology, and Management 24, no. 2 (January 1, 2013). Accessed February 23, 2025. https://jastm.org/index.php/jastm/article/view/11807.