Klopman, Gilles (1968-01-01). “Chemical reactivity and the concept of charge- and frontier-controlled reactions”. Journal of the American Chemical Society90 (2): 223–234. doi:10.1021/ja01004a002. ISSN0002-7863.
Salem, Lionel (1968-01-01). “Intermolecular orbital theory of the interaction between conjugated systems. I. General theory”. Journal of the American Chemical Society90 (3): 543–552. doi:10.1021/ja01005a001. ISSN0002-7863.
Klopman, Gilles (1968-01-01). “Chemical reactivity and the concept of charge- and frontier-controlled reactions”. Journal of the American Chemical Society90 (2): 223–234. doi:10.1021/ja01004a002. ISSN0002-7863.
Salem, Lionel (1968-01-01). “Intermolecular orbital theory of the interaction between conjugated systems. I. General theory”. Journal of the American Chemical Society90 (3): 543–552. doi:10.1021/ja01005a001. ISSN0002-7863.