The nonrigid molecular symmetry group (supergroup) for propane and three deuterated derivatives is used as an aid in making vibrational assignments. Higher energy vibrations retain the symmetry-induced degeneracies of the supergroup, while lower energy vibrations must be classified according to the point group symmetry. © 1975.
Flurry, R. L. (1975). Vibrational assignments for propane from the nonrigid molecular symmetry group. Journal of Molecular Spectroscopy, 56(1), 88–92. https://doi.org/10.1016/0022-2852(75)90205-2