Notes on soft breaking of BRST symmetry in the Batalin-Vilkovisky   formalism
  We have proved the nilpotency of the operators which describe the gauge dependence of the generating functionals of Green's functions for the gauge theories with the soft breaking of BRST symmetry in the Batalin-Vilkovisky formalism. 
Olga V. Radchenko, Alexander A. Reshetnyak
hep-th math-ph math.MP