A 3-form gauge potential in 5D in connection with a possible dark sector of 4D-electrodynamicsD. Cocuroci, M. J. Neves, J. A. Helayël-Neto and L. P. R. OspedalEur. Phys. J. C, 75 7 (2015) 322DOI: https://doi.org/10.1140/epjc/s10052-015-3540-4