Saurabh Sharma and  Yong Sun and  Bruce Vernham,  Predictive Semi-Empirical NOx Model for Diesel Engine.   journal   = {International Journal of Energy and Power Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2019, vol. 149(5). 365 - 376
    [viewed 16 December 2019]. Available from: https://publications.waset.org/pdf/10010410.