@article{DA,
      author = {Hufnagel, C. A.},
      url = {http://digitalcollections.ohsu.edu/record/4588},
      title = {Hufnagel valve and graft},
      abstract = {ca. 1952-1958},
      number = {DA},
      doi = {https://doi.org/10.6083/M48W3BQZ},
      recid = {4588},
      address = {1958},
}