Reference Label	Details
El-Sayed 1961	M. F. A. El-Sayed, M. Kaaba, and Y. Tanaka, J. Chem. Phys. 34, 334-335 (1961) Ionization Potentials of Benzene, Hexadeuterobenzene, and Pyridine from Their Observed Rydberg Series in the Region 600-2000 Å