The barcodes follow the UPC-A, UPC-E, EAN-8 or EAN-13 standards.
-http://en.wikipedia.org/wiki/Universal_Product_Code
-http://en.wikipedia.org/wiki/European_Article_Number
+https://en.wikipedia.org/wiki/Universal_Product_Code
+https://en.wikipedia.org/wiki/European_Article_Number
Written by Dan Bornstein and Jamie Zawinski; 2003.
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