Chies-Santos, A.L., Rodriguez del Pino, B., Aragón-Salamanca, A., Bamford, S.P., Gray, M.E., Wolf, C., Bohm, A., Maltby, D.T., Pintos-Castro, I., Sanchez-Portal, M., Weinzirl, T., "OMEGA - OSIRIS Mapping of Emission-line Galaxies in A901/2: I. Survey description, data analysis, and star formation and AGN activity in the highest density regions", Monthly Notices of the Royal Astronomical Society, 2015