Hot subdwarf stars in close-up view - I. Rotational properties of subdwarf B stars in close binary systems and nature of their unseen companionsS. Geier, U. Heber, Ph. Podsiadlowski, H. Edelmann, R. Napiwotzki, T. Kupfer and S. MüllerA&A, 519 (2010) A25DOI: https://doi.org/10.1051/0004-6361/201014465
