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Negation Sources
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Back to Negation Requirements
- Alan Rector, What's in a Code?
- On separation of ontology from terminology & use of "situation" construct to harmonize positive & negative assertions
- Alan Rector, Negation & Null Values (rough notes)
- On preference for "absent" to "negation," at least at first
- SNOMED CT Technical Implementation Guide: see 7.8.2.4.7 Retrieving absent findings
