Hamiltonian cohomological derivation of four-dimensional nonlinear gauge   theories
  Consistent couplings among a set of scalar fields, two types of one-forms and a system of two-forms are investigated in the light of the Hamiltonian BRST cohomology, giving a four-dimensional nonlinear gauge theory. The emerging interactions deform the first-class constraints, the Hamiltonian gauge algebra, as well as the reducibility relations. 
C. Bizdadea, E. M. Cioroianu, S. O. Saliu