The nature of B supergiants: clues from a steep drop in rotation rates at 22 000 K - The possibility of bi-stability brakingJorick S. Vink, I. Brott, G. Gräfener, N. Langer, A. de Koter and D. J. LennonA&A, 512 (2010) L7DOI: https://doi.org/10.1051/0004-6361/201014205
