Entropy for dilatonic black hole
  The area formula for entropy is extended to the case of a dilatonic black hole. The entropy of a scalar field in the background of such a black hole is calculated semiclassically. The area and cutoff dependences are normal {\it except in the extremal case}, where the area is zero but the entropy nonzero. 
A. Ghosh and P. Mitra (Saha Institute of Nuclear Physics)