Citation:
Cochran WD, Fabrycky DC, Torres G, Fressin F, Désert J-M, Ragozzine D, Sasselov D, Fortney JJ, Rowe JF, Brugamyer EJ, et al. Kepler-18b, c, and d: A System of Three Planets Confirmed by Transit Timing Variations, Light Curve Validation, Warm-Spitzer Photometry, and Radial Velocity Measurements. \apjs. 2011;197 (1) :7.