@article{kim:liao:imai:19,
  title = {Measuring Trade Profile with Granular Product-level Trade Data},
  author = {Kim, In Song and Steven Liao and Kosuke Imai},
  Journal = {American Journal of Political Science}, 
  year= {2020},
  pages = {102-117},
  vol = {64},
  number = {1}
}