String theory: a perspective over the last 25 years
  This article provides some historical background and then reviews developments in string theory over the last twenty-five years or so. Both perturbative and non-perturbative approaches to string theory are surveyed and their impact on how we view quantum gravity is analysed. 
Sunil Mukhi (Tata Institute of Fundamental Research)
physics.pop-ph gr-qc hep-ph hep-th