Reference Label	Details
est unc	estimated uncertainty
Eland 1978	J. H. D. Eland, J. Berkowitz, H. Schulte, and R. Frey, Int. J. Mass Spectrom. Ion Phys. 28, 297-311 (1978) Rates of Unimolecular Pyridine Ion Decay and the Heat of Formation of C4H4+
Jonsson 1969	B.-Ö. Jonsson, E. Lindholm, and A. Skerbele, Int. J. Mass Spectrom. Ion Phys. 3, 385-396 (1969) The Electronic Structure of Pyridine
Turner 1967	D. W. Turner, Tetrahedron Lett. 35, 3419-3420 (1967) Photoelectron Spectra of Benzene, Hexafluorobenzene, and Pyridine