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We review our recent one-loop calculation of all the two meson scatteringamplitudes within SU(3) Chiral Perturbation Theory, i.e. with pions, kaons andetas. By unitarizing these amplitudes we are able to generate dynamically thelightest resonances in meson-meson scattering. We thus obtain a remarkabledescription of the meson-meson scattering data right from threshold up to 1.2GeV, in terms of chiral parameters in good agreement with previousdeterminations.Comment: 4 pages, To appear in the Proceedings of the IX International  Conference on Hadron Spectroscopy, HADRON2001, IHEP, Protvino, Russia, August  200

Complete meson-meson scattering within one loop in Chiral Perturbation Theory: Unitarization and resonances