Beuther, H., Bihr, S., Rugel, M., Johnston, K., Wang, Y., Walter, F., et al. (2016). The HI/OH/Recombination line survey of the inner Milky Way (THOR). Survey overview and data release 1. Astronomy and Astrophysics, 595: A32, pp. A32. doi:10.1051/0004-6361/201629143.