Electron-polaron–electron-polaron bound states in mass-gap graphene-like planar quantum electrodynamics: s-wave bipolaronsOswaldo M. Del Cima and Emerson S. MirandaEur. Phys. J. B, 91 10 (2018) 212DOI: https://doi.org/10.1140/epjb/e2018-90252-0