1. J. A. Pople, Molecular orbital studies of conformation, Tetrahedron
30, 1605–1615 (1974).
2. A. Golebiewski and A. Parczewski, Theoretical conformational analysis of organic molecules, Chem. Rev.
74, 519–530 (1974).
3. D. T. Clark, Theoretical organic chemistry and ESCA, Annu. Rep. Prog. Chem., 69(B), 40–83 (1973).
4. A. Veillard, Ab initio calculations of barrier heights, in : Internal Rotation in Molecules (W. J. Orville-Thomas, ed.), pp. 385–421, John Wiley and Sons, New York (1974).
5. W. Orville-Thomas, Internal rotation in molecules, in : Internal Rotation in Molecules (W. J. Orville-Thomas, ed.), pp. 1–18, John Wiley and Sons, New York (1974).