Gender Pay Disparity in Portuguese Firms: Towards the Crackling of the Glass Ceiling?. - Santos, M-C.; Curto, J.; Duarte, C.; Carapeto, M.; Esperança, J. (Proceedings of the 6th Biennial International Interdisciplinary Conference, GWO-Gender Work and Organization Conference, pp. 120, June 21st ? 23rd, 2009)