@misc{1170331,
  author = {Richard Ku and Patsy B Saunders},
  title = {Sequencing the purchase and retirement of fire engines:},
  year = {1971},
  month = {1971-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.RPT.10498},
  language = {en},
}