@article{machado_larkin_piquini_2009,  title={Electronic and structural properties of two mirrored boron-nitride nanocones with 240º disclination},  volume={39},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97332009000200020},  DOI={10.1590/S0103-97332009000200020},  number={1a},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Machado, M. and Larkin, I. A. and Piquini, P.},  year={2009},  month={Apr},  pages={239–241} }