@misc{indiciaeebff67ed46c3,
  title = {Calcium ion binding to a soil fulvic acid using a donnan potential model},
  author = {J.A. Marinsky and A. Mathuthu and J.H. Ephraim and M.M. Reddy},
  year = {1999},
  doi = {10.1524/ract.1999.84.4.205},
  url = {https://pubs.usgs.gov/publication/70021156},
  note = {Source identifier: 70021156}
}