Gas versus solid-phase deuterated chemistry: HDCO and D2CO in massive star-forming regions S. Zahorecz, I. Jimenez-Serra, L. Testi, K. Immer, F. Fontani, P. Caselli, K. Wang and L. V. Toth A&A, 602 (2017) L3 Published online: 31 May 2017 DOI: 10.1051/0004-6361/201629792