Fermion family recurrences in the Dyson–Schwinger formalism Felipe J. Llanes-Estrada, Tim Van Cauteren and Ángel P. Martín Eur. Phys. J. C, 51 4 (2007) 945-952 Published online: 01 August 2007 DOI: 10.1140/epjc/s10052-007-0349-9