First detection of extragalactic 13CO(6-5) line emissionG.J. Stacey, S. Hailey-Dunsheath, T. Nikola, T.E. Oberst, S.C. Parshley and C.M. BradfordEAS Publications Series, 31 (2008) 151-154DOI: https://doi.org/10.1051/eas:0831029