@misc{indiciaecd12ca25acfd,
  title = {An improved high performance liquid chromatographic method for determining urinary oxalate, making use of an ID-MS reference method.},
  author = {W Koolstra and B G Wolthers and M Hayer and H M Rutgers},
  year = {1987},
  doi = {10.1016/0009-8981(87)90133-1},
  url = {https://pubmed.ncbi.nlm.nih.gov/3436058/},
  note = {Source identifier: 3436058}
}