Citation:
Mochejska B J, Stanek K Z, Sasselov D D, Szentgyorgyi A H, Westover M, Winn J N. Planets in Stellar Clusters Extensive Search. II. Discovery of 57 Variables in the Cluster NGC 2158 with Millimagnitude Image Subtraction Photometry. \aj. 2004;128 (1) :312-322.