Li, J, Hoffmann R. 1988. Ca3Al2Si2: An Inorganic Structure Analogous to But not Isoelectronic with Polyacene. J. Phys. Chem.. (92):887.

Lindholm, E, Li J. 1988. Energies of s* Orbitals from Extended Huckel Calculations in Combination with HAM Theory. J. Phys. Chem.. (92):1731.