@article{11311_830125,
  author    = {Topputo, Francesco and C., Zhang},
  title     = {Survey of Direct Transcription for Low-Thrust Space Trajectory Optimization with Applications},
  year      = {2014},
  doi       = {10.1155/2014/851720},
  journal   = {ABSTRACT AND APPLIED ANALYSIS},
  volume    = {2014},
  pages     = {1--15},
}