Citation:
Buchhave LA, Dressing CD, Dumusque X, Rice K, Vanderburg A, Mortier A, Lopez-Morales M, Lopez E, Lundkvist MS, Kjeldsen H, et al. A 1.9 Earth Radius Rocky Planet and the Discovery of a Non-transiting Planet in the Kepler-20 System. \aj. 2016;152 (6) :160.