Planar infall of CH3OH gas around Cepheus A HW2A. Sanna, L. Moscadelli, G. Surcis, H. J. van Langevelde, K. J. E. Torstensson and A. M. SobolevA&A, 603 (2017) A94DOI: https://doi.org/10.1051/0004-6361/201730773