@article{liu_han_chen_xie_2013, 
  title={A Method of "Hard-Spot" Threshold Extraction of Pantograph-Catenary Current Collection Parameters of Train-Set}, 
  DOI={10.7763/ijcce.2013.v2.144}, 
  publisher={IACSIT Press}, 
  author={Liu and Han and Chen and Xie}, 
  year={2013}
  }