Unveiling accretion in the massive young stellar object G033.3891 - Spatial and kinematic constraints from the CO bandhead emissionE. Koumpia, D. Sun, M. Koutoulaki, J. D. Ilee, W.-J. de Wit, R. D. Oudmaijer and A. J. FrostA&A, 690 (2024) A209DOI: https://doi.org/10.1051/0004-6361/202449641