@article{troyanov_1991, 
  title={Prescribing curvature on compact surfaces with conical singularities}, 
  volume={324}, 
  DOI={10.1090/s0002-9947-1991-1005085-9}, 
  publisher={American Mathematical Society (AMS)}, 
  author={Troyanov}, 
  year={1991}, 
  month={Feb}
  }