KLAVŽAR, Sandi, 2000, Zhang, Fuji; An, Chang: Acyclic molecules with greatest HOMO-LUMO separation. - Discr. Appl. Math. 98 (1999), no. 1-2, 165-171. Mathematical reviews [na spletu]. 2000. Vol. 2000i. [Dostopano 4 april 2025]. Pridobljeno s: http://www.ams.org/mathscinet/pdf/1723695.pdf