@article{DT032,
   Author = {Wentzcovitch, R. M. and Cohen, M. L. and
             Louie, S. G. and Tomanek, D.},
   Title = {Sigma-states contribution to the conductivity of BC$_3$},
   Journal = {Solid State Commun.},
   Volume = {67},
   Number = {5},
   Pages = {515--518},
   Year = {1988} }