@misc{indiciae287feda87dbd,
  title = {Variable porosity in siliceous skeletons: Determination and importance},
  author = {D.C. Hurd and C. Wenkam and H.S. Pankratz and J. Fugate},
  year = {1979},
  doi = {10.1126/science.203.4387.1340},
  url = {https://pubs.usgs.gov/publication/70012454},
  note = {Source identifier: 70012454}
}