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Ananthanarayan, B and Caprini, I and Colangelo, G and Gasser, J and Leutwyler, H (2004) Scalar form factors of light mesons. In: Physics Letters B, 602 (3-4). pp. 218-225.

Ananthanarayan, B and Leutwyler, H and Gasser, J and Colangelo, G (2001) Roy equation analysis of ππ scattering. In: Physics Reports, 353 (4). pp. 207-279.

Ananthanarayan, B and Colangelo, G and Gasser, J and Leutwyler, H (2000) Roy equation analysis of pi pi scattering. [Preprint]