Electronic properties of double wall BN nanotube under hydrostatic pressure: an ab initio studyWesdney S. Melo, Mauro B. Pereira, Humberto F. Silva Filho and Silvete GueriniEur. Phys. J. B, 88 1 (2015) 6DOI: https://doi.org/10.1140/epjb/e2014-50410-0