@misc{indiciae18f3256111f2,
  title = {Probing the carbonyl functionality of a petroleum resin and asphaltene through oximation and schiff base formation in conjunction with N-15 NMR},
  author = {Kevin A. Thorn and Larry G. Cox},
  year = {2015},
  doi = {10.1371/journal.pone.0142452},
  url = {https://pubs.usgs.gov/publication/70159543},
  note = {Source identifier: 70159543}
}