1. Conformal field theory approach to the Kondo effect;Affleck;Lectures given at the Cracow School of Theoretical Physics,1995
2. Critical theory of overscreened Kondo fixed points;Affleck;Nucl. Phys. B,1991
3. D-brane dynamics;Bachas;Phys. Lett. B,1996
4. C. Bachas, Lectures on D-branes, hep-th/9806199.