@article{ETD,
      school = {M.S.},
      author = {Beeler, William J.},
      url = {http://digitalcollections.ohsu.edu/record/1278},
      title = {Permeability of the apical root foramen of human teeth:  the effect of apical barriers},
      publisher = {Oregon Health Sciences University},
      number = {ETD},
      doi = {https://doi.org/10.6083/M45M63V9},
      recid = {1278},
      address = {1987},
}