Rotational spectra of isotopic species of methyl cyanide, CH3CN, in their ground vibrational states up to terahertz frequenciesH. S. P. Müller, B. J. Drouin and J. C. PearsonA&A, 506 3 (2009) 1487-1499DOI: https://doi.org/10.1051/0004-6361/200912932