A path integral formula for quark condensate states in a modified PQCDA. Cabo Montes de Oca, N. G. Cabo-Bizet and A. Cabo-BizetEur. Phys. J. C, 64 1 (2009) 133-145DOI: https://doi.org/10.1140/epjc/s10052-009-1127-7