Rigid rotor/Bibliography

General references
 * D. M. Dennison, Rev. Mod. Physics, vol. 3, pp. 280-345, (1931) (Especially Section 2: The Rotation of Polyatomic Molecules).
 * J. H. Van Vleck, Rev. Mod. Physics, vol. 23, pp. 213-227 (1951).
 * H. Goldstein, C. P. Poole, J. L. Safko, Classical Mechanics, Third Ed., Addison Wesley Publishing Company, San Francisco (2001) ISBN 0-201-65702-3.  (Chapters 4 and 5)
 * V. I. Arnold, Mathematical Methods of Classical Mechanics, Springer-Verlag (1989), ISBN 0-387-96890-3. (Chapter 6).
 * H. W. Kroto, Molecular Rotation Spectra, Dover Inc., New York, (1992).
 * W. Gordy and R. L. Cook, Microwave Molecular Spectra, Third Ed., Wiley, New York (1984).
 * D. Papoušek and M. T. Aliev, Molecular Vibrational-Rotational Spectra, Elsevier, Amsterdam (1982).
 * D. Papoušek and M. T. Aliev, Molecular Vibrational-Rotational Spectra, Elsevier, Amsterdam (1982).