Water isotopologues in the circumstellar envelopes of M-type AGB stars T. Danilovich, R. Lombaert, L. Decin, A. Karakas, M. Maercker and H. Olofsson A&A, 602 (2017) A14 Published online: 24 May 2017 DOI: 10.1051/0004-6361/201630055