Peng, Kang, et al. “Generation Mechanism of NOx and N2O Precursors (NH3 and HCN) from Aspartic Acid Pyrolysis: A DFT Study”. International Journal of Agricultural and Biological Engineering, vol. 9, no. 5, Sept. 2016, pp. 166-7, doi:10.25165/ijabe.v9i5.2559.