SportsFaces: A Graphical Password System based on Images of Sports Celebrities. - Sajida Kalsoom; Sheikh Ziauddin; Muhammad Tahir 008 (IICS, 2011)

An Image-Based CAPTCHA Scheme Exploiting Human Appearance Characteristics. - Sajida Kalsoom; Sheikh Ziauddin; Abdul Rehman Abbasi (KSII Trans. Internet Inf. Syst., 2012)