Covariant electroweak nucleon form factors in a chiral constituent-quark model S. Boffi, L.Ya. Glozman, W. Klink, W. Plessas, M. Radici and R.F. WagenbrunnEur. Phys. J. A, 14 1 (2002) 17-21DOI: https://doi.org/10.1140/epja/iepja1403