Tracing Hercules in Galactic azimuth with Gaia DR2G. Monari, B. Famaey, A. Siebert, O. Bienaymé, R. Ibata, C. Wegg and O. GerhardA&A, 632 (2019) A107DOI: https://doi.org/10.1051/0004-6361/201936455
