Non-perturbative renormalization of lattice four-fermion operators without power subtractions A. Donini, V. Giménez, G. Martinelli, M. Talevi and A. Vladikas Eur. Phys. J. C, 10 1 (1999) 121-142 Published online: 15 July 1999 DOI: 10.1007/s100529900097