Study of the molecular and ionized gas in a possible precursor of an ultra-compact H II regionM. E. Ortega, S. Paron, E. Giacani, M. Celis Peña, M. Rubio and A. PetriellaA&A, 606 (2017) A61DOI: https://doi.org/10.1051/0004-6361/201730879
