Microscopic Entropy of N=2 Extremal Black Holes
  String theory is used to compute the microscopic entropy for several examples of black holes in compactifications with $N=2$ supersymmetry. Agreement with the Bekenstein-Hawking entropy and the moduli-independent $N=2$ area formula is found in all cases. 
David M. Kaplan, David A. Lowe, Juan M. Maldacena and Andrew   Strominger