@misc{1155721,
  author = {Helmut Hellwig},
  title = {Hydrogen spin exchange frequency shifts.:},
  year = {1970},
  month = {1970-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.TN.387},
  language = {en},
}