Graphene and boron nitride nanoribbons with multiple doping: an ab initio study T. Guerra, L. R. S. Araújo and S. Azevedo Eur. Phys. J. B, 94 3 (2021) 67 Published online: 22 March 2021 DOI: 10.1140/epjb/s10051-021-00070-6