1. S. Weinberg, Phenomenological Lagrangians, Physica A 96 (1979) 327 [INSPIRE].
2. J. Gasser and H. Leutwyler, Chiral perturbation theory to one loop, Annals phys. 158 (1984) 142 [INSPIRE].
3. G. Ecker, J. Gasser, A. Pich and E. de Rafael, The role of resonances in chiral perturbation theory, Nucl. Phys. B 321 (1989) 311 [INSPIRE].
4. G. Ecker, J. Gasser, H. Leutwyler, A. Pich and E. de Rafael, Chiral Lagrangians for massive spin 1 fields, Phys. Lett. B 223 (1989) 425 [INSPIRE].
5. V. Cirigliano, G. Ecker, M. Eidemuller, R. Kaiser, A. Pich and J. Portoles, Towards a consistent estimate of the chiral low-energy constants, Nucl. Phys. B 753 (2006) 139 [hep-ph/0603205] [INSPIRE].