Del Re, G., Berthier, G., & Serre, J. (1980). Electronic states of molecules and atom clusters: Foundations and prospects of semiempirical methods. Springer-Verlag.

Del Re, Giuseppe, Gaston Berthier, and Josiane Serre. Electronic States of Molecules and Atom Clusters: Foundations and Prospects of Semiempirical Methods. Berlin ; New York: Springer-Verlag, 1980.

Del Re, Giuseppe, et al. Electronic States of Molecules and Atom Clusters: Foundations and Prospects of Semiempirical Methods. Springer-Verlag, 1980.