Heavy quark symmetry: ideas and applications
  This report is a combined version of two talks presented by the authors at the Edinburgh $b$-physics Workshop, December 1991. It presents the ideas of heavy quark symmetry and gives an introduction to some applications. The references indicate where to go for more information: they are not intended to be complete, nor do they necessarily refer to the original work on any particular subject. 
J M Flynn and N Isgur