Professor Emeritus N. C. Craig publishes in Journal of Molecular Spetroscopy

A recent paper by Norm Craig, Emeritus Professor of Chemistry:

Craig, Norman C., Peter Groner, Andrew R. Conrad, Ranil Gurusinghe, Michael J. Tubergen.
Microwave spectra for the three C-13(1) isotopologues of propene and new rotational constants for propene and its C-13(1) isotopologues.
Journal of Molecular Spectroscopy, 328 1-6; 10.1016/j.jms.2016.07.002 OCT 2016.

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The SAO/NASA Astrophysics Data System.