@article{DA,
      url = {http://digitalcollections.ohsu.edu/record/6827},
      title = {Starr-Edwards heart valves, ball components},
      abstract = {Digital scan of a 35mm slide. Image of four silastic balls  from Starr-Edwards heart valves showing wear of ball  component over time. At top left is a new ball, labeled  PRODUCTION BALL. Also shown are three discolored balls, two  showing additional damage to the ball surface, labeled  DISCOLORED and DISCOLORED, DAMAGED. All for are shown on a  reddish-brown background.},
      number = {DA},
      doi = {https://doi.org/10.6083/M41J98DR},
      recid = {6827},
}