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A.L. Kaledin and W.H. Miller, "Time averaging the semiclassical initial value representation for the calculation of vibrational energy levels," J. Chem. Phys. 118, 7174 (2003); "Time averaging the semiclassical initial value representation for the calculation of vibrational energy levels. II. Application to H2CO, NH3, CH4, CH2D2," ibid. 119, 3078 (2003).