Skowron, J., Udalski, A., Gould, A., Dong, S., Monard, L. A. G., Han, C., et al. (2011). Binary Microlensing Event Ogle-2009-BLG-020 Gives Verifiable Mass, Distance, and Orbit Predictions. Astrophysical Journal, 738(1): 87. doi:10.1088/0004-637X/738/1/87.