Video Source: Explaining the Future | Christopher Barnatt
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Explaining the Future
Explaining the Future YouTube channel
Video Source: Institute of Physics
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Invisible QR codes tackle counterfeit bank notes
Jeevan M Meruga, William M Cross, P Stanley May, QuocAnh Luu, Grant A Crawford, Jon J Kellar, Security printing of covert quick response codes using upconverting nanoparticle inks, Nanotechnology, 2012, DOI: 10.1088/0957-4484/23/39/395201