Non-perturbative renormalization of lattice four-fermion operators without power subtractions A. Donini, V. Giménez, G. Martinelli, M. Talevi and A. VladikasEur. Phys. J. C, 10 1 (1999) 121-142DOI: https://doi.org/epjc/v10/p121(epjc0097)