New solutions for graphene with scalar potentials by means of generalized intertwining M. V. Ioffe, D. N. Nishnianidze and E. V. Prokhvatilov Eur. Phys. J. Plus, 134 9 (2019) 450 Published online: 17 September 2019 DOI: 10.1140/epjp/i2019-12798-3