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Text-based CAPTCHAs over the years

Y W Chow, W Susilo
2017 IOP Conference Series: Materials Science and Engineering  
The notion of CAPTCHAs has been around for more than two decades.
doi:10.1088/1757-899x/273/1/012001 fatcat:cvjxhv4lobaujj2gmwdlqs4auq