Spectroscopic twin to the hypervelocity sdO star US 708 and three fast sdB stars from the Hyper-MUCHFUSS projectE. Ziegerer, U. Heber, S. Geier, A. Irrgang, T. Kupfer, F. Fürst and J. SchaffenrothA&A, 601 (2017) A58DOI: https://doi.org/10.1051/0004-6361/201730437
