https://www.secureauth.com/products/secureauth-idp/behavioral-biometrics

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https://support.apple.com/en-us/HT204587

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https://www.hindawi.com/journals/tswj/2014/246083/

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https://www.nuance.com/omni-channel-customer-engagement/security/multi-modal-biometrics/vocalpassword.html

https://securityintelligence.com/the-evolution-of-voice-authentication-as-a-security-method/

http://www.telegraph.co.uk/technology/2016/05/26/biometrics-will-replace-passwords-but-its-a-bad-idea/

https://www.theatlantic.com/technology/archive/2016/04/the-underlying-bias-of-facial-recognition-systems/476991/

https://motherboard.vice.com/en_us/article/kb7bdn/the-inherent-bias-of-facial-recognition

https://www.theatlantic.com/technology/archive/2014/07/makeup/374929/

https://www.theverge.com/2016/11/3/13507542/facial-recognition-glasses-trick-impersonate-fool

https://www.csoonline.com/article/2892121/microsoft-subnet/avg-invisibility-glasses-and-other-slick-tactical-tricks-to-fool-face-recognition.html

http://weburbanist.com/2016/11/28/how-to-be-invisible-15-anti-surveillance-designs-installations/