Harmonic frequencies and anharmonicity constants for the antisymmetric SO4 stretching vibrations of isomorphously isolated SO4 ions in K2CrO4,

V. Petruševski, W.F. Sherman, Harmonic frequencies and anharmonicity constants for the antisymmetric SO4 stretching vibrations of isomorphously isolated SO4 ions in K2CrO4, Journal of Molecular Structure, 219, 171–176 (1990).