The millimeter-wave spectrum of methyl ketene and the astronomical search for it C. Bermúdez, B. Tercero, R. A. Motiyenko, L. Margulès, J. Cernicharo, Y. Ellinger and J.-C. Guillemin A&A, 619 (2018) A92 Published online: 12 November 2018 DOI: 10.1051/0004-6361/201833267