Molecular constants of non-bridged X2Y6 systems : - Part II. — Generalised mean-square amplitudes of vibration and Coriolis coupling constantsK. Venkateswarlu and A. NatarajanJ. Chim. Phys., 66 (1969) 1324-1326DOI: https://doi.org/10.1051/jcp/196966s21325