Deuteration as an evolutionary tracer in massive-star formationF. Fontani, A. Palau, P. Caselli, Á. Sánchez-Monge, M. J. Butler, J. C. Tan, I. Jiménez-Serra, G. Busquet, S. Leurini and M. AudardA&A, 529 (2011) L7DOI: https://doi.org/10.1051/0004-6361/201116631