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Caprini, Irinel; Colangelo, Gilberto; Leutwyler, Heiri (2006). Theoretical aspects of the pion pion interaction. International journal of modern physics. A - particles and fields, gravitation, cosmology, 21(4), pp. 954-957. Singapore: World Scientific 10.1142/S0217751X0603240X
Caprini, Irinel; Colangelo, Gilberto; Leutwyler, Heiri (2006). Mass and width of the lowest resonance in QCD. Physical review letters, 96(13), p. 132001. Ridge, N.Y.: American Physical Society 10.1103/PhysRevLett.96.132001
