Hawke, L. G. D., Kalosakas, G., & Simserides, C. (2009). Empirical LCAO parameters for<i>π</i>molecular orbitals in planar organic molecules. Molecular Physics : an international journal at the interface between chemistry and physics, 107(17), 1755-1771. https://doi.org/10.1080/00268970903049089 (Original work published 2009)