@misc{indiciaee8e48a94ab95, title = {Extraction vs. nonextraction. And a third.}, author = {R D Helmholdt}, year = {1999}, doi = {10.14219/jada.archive.1999.0079}, url = {https://pubmed.ncbi.nlm.nih.gov/10573925/}, note = {Source identifier: 10573925} }