Group delay time of fermions in graphene through tilted potential barrier Youssef Fattasse, Miloud Mekkaoui, Ahmed Jellal and Abdelhadi Bahaoui Eur. Phys. J. B, 95 8 (2022) 128 Published online: 12 August 2022 DOI: 10.1140/epjb/s10051-022-00391-0