Quantum dot in a graphene layer with topological defects M. J. Bueno, J. Lemos de Melo, Claudio Furtado and Alexandre M. de M. Carvalho Eur. Phys. J. Plus, 129 9 (2014) 201 Published online: 29 September 2014 DOI: 10.1140/epjp/i2014-14201-5