Habibi, M., Gillessen, S., Martins, F., Eisenhauer, F., Plewa, P. M., Pfuhl, O., et al. (2017). Twelve years of spectroscopic monitoring in the Galactic Center: the closest look at S-stars near the black hole. The Astrophysical Journal, 847(2): 120. doi:10.3847/1538-4357/aa876f.