Singly and doubly deuterated formaldehyde in massive star-forming regions S. Zahorecz, I. Jimenez-Serra, L. Testi, K. Immer, F. Fontani, P. Caselli, K. Wang and T. Onishi A&A, 653 (2021) A45 Published online: 07 September 2021 DOI: 10.1051/0004-6361/201937012