Reference 329
J. V. Ortiz, V. G. Zakrzewski and O. Dolgounircheva, "One-Electron Pictures of Electronic Structures: Propagator Calculations of Photoelectron Spectra of Aromatic Molecules," in Conceptual Perspectives in Quantum Chemistry, Ed. J.-L. Calais and E. Kryachko (Kluwer Academic, 1997) p. 465.