Bydžovský, P., Kaminski, R., Nazari, V. Modified pi pi amplitude with sigma pole. Physical Review D: Particles, Fields, Gravitation and Cosmology. 2014, 90(11), 116005. ISSN 1550-7998. E-ISSN 2470-0029. Dostupné z: https://doi.org/10.1103/PhysRevD.90.116005