Hiberty, P. C., & Braïda, B. Pleading for a Dual Molecular-Orbital/Valence-Bond Culture. Angew. Chem. Int. Ed., 2018, 57(21), 5994–6002.
https://doi.org/10.1002/anie.201710094

V. I. Alabugin, Stereoelectronic Effects: A Bridge Between Structure and Reactivity, Wiley, 2016. ISBN: 978-1-118-90634-7