1. ISO/IEC 16022: Information technology -- Automatic identification and data capture techniques -- Data Matrix bar code symbology specification. ISO/IEC 16022: Information technology -- Automatic identification and data capture techniques -- Data Matrix bar code symbology specification.
2. ISO/IEC 18004: Information technology -- Automatic identification and data capture techniques -- QR Code 2005 bar code symbology specification. ISO/IEC 18004: Information technology -- Automatic identification and data capture techniques -- QR Code 2005 bar code symbology specification.
3. Official ZXing ("Zebra Crossing") project home. https://github.com/zxing/zxing accessed July 18th 2014. Official ZXing ("Zebra Crossing") project home. https://github.com/zxing/zxing accessed July 18th 2014.
4. 3GVision. i-nigma. Apple App Store. https://itunes.apple.com/en/app/id388923203. 3GVision. i-nigma. Apple App Store. https://itunes.apple.com/en/app/id388923203.
5. 3GVision. i-nigma Barcode Scanner. Google Play Store. https://play.google.com/store/apps/details?id=com.threegvision.products.inigma.Android. 3GVision. i-nigma Barcode Scanner. Google Play Store. https://play.google.com/store/apps/details?id=com.threegvision.products.inigma.Android.