#ean
- Corrected PostgreSQL EAN Functions
https://justatheory.com/2006/05/postgres-ean-validation
- My First C: A GTIN Data Type for PostgreSQL
https://justatheory.com/2006/09/postgres-gtin-0.01
- Validating UPCs with PL/pgSQL
https://justatheory.com/2006/05/plpgsql-upc-validation
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