Reference Label	Details
Kimura 1981	K. Kimura, S. Katsumata, Y. Achiba, T. Yamazaki, and S. Iwata, "Ionization Energies, ab initio Assignments, and Valence Electronic Structure for 200 Molecules", in "Handbook of HeI Photoelectron Spectra of Fundamental Organic Compounds", Japan Scientific Soc. Press: Tokyo 1981
est unc	estimated uncertainty