@misc{1191201,
  author = {Margaret W Chapman},
  title = {Circular of the Bureau of Standards no. 575::bibliography on nitrogen 15},
  year = {1956},
  month = {1956-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.CIRC.575},
  language = {en},
}