Stability and Band Gap Constancy of Boron Nitride Nanotubes Blase, X. ; Rubio, A. ; Louie, S. G. ; Cohen, M. L. Abstract Publication: EPL (Europhysics Letters) Pub Date: November 1994 DOI: 10.1209/0295-5075/28/5/007 Bibcode: 1994EL.....28..335B