William S. Johnson, Victor J. Bauer, John L. Margrave, Margaret A. Frisch, Lloyd H. Dreger, Ward N. Hubbard,
The Energy Difference between the Chair and Boat Forms of Cyclohexane. The Twist Conformation of Cyclohexane Journal of the American Chemical Society. ,vol. 83, pp. 606- 614 ,(1961) ,
10.1021/JA01464A027