Solving Four Dimensional Field Theories with the Dirichlet Fivebrane
  The realization of ${\cal N}=2$ four dimensional super Yang-Mills theories in terms of a single Dirichlet fivebrane in type IIB string theory is considered. A classical brane computation reproduces the full quantum low energy effective action. This result has a simple explanation in terms of mirror symmetry. 
R. de Mello Koch and J.P. Rodrigues