Reference Label	Details
Jacox 1994	M. E. Jacox, "Vibrational and Electronic Energy Levels of Polyatomic Transient Molecules", J. Phys. Chem. Ref. Data, Monogr. 3 (1994) Web: http://www.nist.gov/data/PDFfiles/jpcrdM3.pdf
Jensen 1988	P. Jensen and P. R. Bunker, J. Chem. Phys. 89, 1327-1332 (1988) The Potential Surface and Stretching Frequencies of X 3B1 Methylene (CH2) Determined from Experiment using the Morse Oscillator-Rigid Bender Internal Dynamics Hamiltonian