@misc{indiciae6ee9de35b28f,
  title = {Nonlinear negative refraction by difference frequency generation},
  author = {Cao, Jianjun and Shen, Dongyi and Feng, Yaming and Wan, Wenjie},
  year = {2016},
  doi = {10.1063/1.4948974},
  url = {https://www.osti.gov/biblio/22591690},
  note = {Source identifier: 22591690}
}