The IACOB project - III. New observational clues to understand macroturbulent broadening in massive O- and B-type starsS. Simón-Díaz, M. Godart, N. Castro, A. Herrero, C. Aerts, J. Puls, J. Telting and L. GrassitelliA&A, 597 (2017) A22DOI: https://doi.org/10.1051/0004-6361/201628541
