Terrestrial deuterium-to-hydrogen ratio in water in hyperactive comets Dariusz C. Lis, Dominique Bockelée-Morvan, Rolf Güsten, Nicolas Biver, Jürgen Stutzki, Yan Delorme, Carlos Durán, Helmut Wiesemeyer and Yoko Okada A&A, 625 (2019) L5 Published online: 20 May 2019 DOI: 10.1051/0004-6361/201935554