Theoretical calculation of excitonic binding energies and optical absorption spectra for Armchair graphene nanoribbonsL. Mohammadzadeh, A. Asgari, S. Shojaei and E. AhmadiEur. Phys. J. B, 84 2 (2011) 249-253DOI: https://doi.org/10.1140/epjb/e2011-20491-4