Comment on “Hindered rotor density-of-states interpolation function” [J. Chem. Phys. 106, 6675 (1997)] and “The hindered rotor density-of-states” [J. Chem. Phys. 108, 1748 (1998)]

It is demonstrated that an approximation to the partition function of a hindered rotor derived by McClurg, Flagan, and Goddard III is an equivalent of a formula published by Pitzer and Gwinn in 1942. Error in analytical expression for internal energy is pointed out. Classical density-of-states function derived by McClurg in a subsequent article has also been published before.