Microwave and submillimeter spectroscopy and first ISM detection of 18O-methyl formate B. Tercero, L. Margulès, M. Carvajal, R. A. Motiyenko, T. R. Huet, E. A. Alekseev, I. Kleiner, J. C. Guillemin, H. Møllendal and J. Cernicharo A&A, 538 (2012) A119 Published online: 10 February 2012 DOI: 10.1051/0004-6361/201117072