Turkish Journal of Physics
We equip the exterior algebra of Riemann manifold by the odd symplectic structure. Then, by its use we construct the equivariant even (pre)symplectic structure, whose Poincare - Cartan invariants of the second structure define the equivariant Euler classes of the surfaces.
NERSESSIAN, ARMEN (2000) "From antibracket to equivariant characteristic classes," Turkish Journal of Physics: Vol. 24: No. 3, Article 22. Available at: https://journals.tubitak.gov.tr/physics/vol24/iss3/22