A large-scale survey for variable stars in M33
  We have started a survey of M 33 in order to find variable stars and Cepheids in particular. We have obtained more than 30 epochs of g'r'i' data with the CFHT and the one-square-degree camera MegaCam. We present first results from this survey, including the search for variable objects and a basic characterization of the various groups of variable stars. 
D. Bersier, J.D. Hartman, K.Z. Stanek, J.-P. Beaulieu, J. Kaluzny,   J.-B. Marquette, A. Schwarzenberg-Czerny, V. Scowcroft,...