Coherent states in the symmetric gauge for graphene under a constant perpendicular magnetic field E. Díaz-Bautista, J. Negro and L. M. Nieto Eur. Phys. J. Plus, 136 5 (2021) 505 Published online: 07 May 2021 DOI: 10.1140/epjp/s13360-021-01490-0