MO analysis of the high statistics Belle results on γ γ→π + π −, π 0 π 0 with chiral constraintsR. García-Martín and B. MoussallamEur. Phys. J. C, 70 1-2 (2010) 155-175DOI: https://doi.org/10.1140/epjc/s10052-010-1471-7