@article{he_liu_xia_du_guo_2014, 
  title={The Optimal Price Ratio of Typical Energy Sources in Beijing Based on the Computable General Equilibrium Model}, 
  DOI={10.3390/en7052961}, 
  publisher={MDPI AG}, 
  author={He and Liu and Xia and Du and Guo}, 
  year={2014}, 
  month={Apr}
  }