Fermionic bound states in Minkowski space: light-cone singularities and structureWayne de Paula, Tobias Frederico, Giovanni Salmè, Michele Viviani and Rafael PimentelEur. Phys. J. C, 77 11 (2017) 764DOI: https://doi.org/10.1140/epjc/s10052-017-5351-2