+++3 acs aip wiley СПАСИБО!

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1.Energy Levels and Thermodynamic Functions for Molecules with Internal Rotation I. Rigid Frame with Attached Tops
Kenneth S. Pitzer and William D. Gwinn
J. Chem. Phys. 10, 428 (1942)

DOI:

http://dx.doi.org/10.1063/1.1723744

2.Numerical Evaluation of Energy Levels and Wave Functions for Hindered Internal Rotation
Gianfranco Ercolani
J. Chem. Educ., 2000, 77 (11), p 1495

DOI:

http://dx.doi.org/10.1021/ed077p1495

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3. A simple approximation for the vibrational partition function of a hindered internal rotation
Donald G. Truhlar
Volume 12, Issue 2, pages 266–270, March 1991

DOI:

http://dx.doi.org/10.1002/jcc.540120217

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