Dual-BRST symmetry: 6D Abelian 3-form gauge theory R. Kumar, S. Krishna, A. Shukla and R.P. Malik Eur. Phys. J. C, 72 4 (2012) 1980 Published online: 27 April 2012 DOI: 10.1140/epjc/s10052-012-1980-7