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Gasser, Jürg; Haefeli, Christoph; Ivanov, Mikhail (2007). Integrating out strange quarks in ChPT. Physics letters. B, 652(1), pp. 21-26. Amsterdam: Elsevier 10.1016/j.physletb.2007.06.058
Gasser, Jürg; Ivanov, Mikhail; Sainio, Mikko (2006). Revisiting gamma gamma --> pi+ pi- at low energies. Nuclear physics. B, 745(1-2), pp. 84-108. Amsterdam: North Holland 10.1016/j.nuclphysb.2006.03.022
