@misc{1167436,
  author = {Norman C Severo},
  title = {A statistical chain ratio method for determining the distribution of mail by destination:},
  year = {1957},
  month = {1957-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.RPT.5685},
  language = {en},
}