@article{pierceschott2012b,
Author = {Pierce, Justin R. and Peter K. Schott},
Title = {
A Concordance Between U.S. Harmonized System Codes and SIC/NAICS Product Classes and Industries},
Journal = {Journal of Economic and Social Measurement},
Volume = {37},
Number = {1-2},
Year = {2012},
Pages = {61-96},
}