Matthew J. Holman et al. Kepler-9: A System of Multiple Planets Transiting a Sun-Like Star, Confirmed by Timing Variations (англ.) // Science : journal. — 2010. — Vol. 330, no. 6000. — P. 51—54. — doi:10.1126/science.1195778. — Bibcode: 2010Sci...330...51H.
Matthew J. Holman et al. Kepler-9: A System of Multiple Planets Transiting a Sun-Like Star, Confirmed by Timing Variations (англ.) // Science : journal. — 2010. — Vol. 330, no. 6000. — P. 51—54. — doi:10.1126/science.1195778. — Bibcode: 2010Sci...330...51H.