A fresh look at hadronic light-by-light scattering in the muon g - 2 with the Dyson-Schwinger approachC.S. Fischer, T. Goecke and R. WilliamsEur. Phys. J. A, 47 2 (2011) 28DOI: https://doi.org/10.1140/epja/i2011-11028-1