The electronic spectra of diphenyl-sulphide and DI-2-pyridyl-sulphide. A CNDO/S treatment Vinicio Galasso, Giuseppe C. Pappalardo and Giuseppe Scarlata J. Chim. Phys., 73 (1976) 523-526 Published online: 29 May 2017 DOI: 10.1051/jcp/1976730523