Fermionic bound states in Minkowski space: light-cone singularities and structure Wayne de Paula, Tobias Frederico, Giovanni Salmè, Michele Viviani and Rafael Pimentel Eur. Phys. J. C, 77 11 (2017) 764 Published online: 14 November 2017 DOI: 10.1140/epjc/s10052-017-5351-2