Holman MJ, Winn JN, Latham DW, O'Donovan FT, Charbonneau D, Bakos GA, Esquerdo GA, Hergenrother C, Everett ME, Pál A. The Transit Light Curve Project. I. Four Consecutive Transits of the Exoplanet XO-1b. \apj. 2006;652 (2) :1715-1723.