Jing Guo, Bing Yan & De-Ling Zeng. (2020). Accurate Ab Initio Potential Energy Curve of $X^2\Pi$ State and High-Temperature $A^2Δ$-$ X^2\Pi$ Fluorescence Spectra for CH Radical.
            <i>Journal of Atomic and Molecular Sciences</i>. <i>4</i> (2).
            183-192.
         doi:10.4208/jams.061112.081212a