http://www.gsma.com/digitalcommerce/wp-content/uploads/2012/08/GSMA-Mobile-NFC-Infrastructure-v1-01.pdf
http://www.gsma.com/digitalcommerce/wp-content/uploads/2013/12/GSMA-TSM-White-Paper-FINAL-DEC-2013.pdf
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https://www.gsma.com/digitalcommerce/