Implementation of quaternion mathematics for biometric security. - Khallaf, Fatma; El-Shafai, Walid; El-Rabaie, El-Sayed M.; Nasr, Mahmoud; Essam, Mohammed; Shoukralla, E. S.; Abd El-atty, Saied M.; Abd El-Samie, Fathi E. (Multimedia Tools & Applications, 2024)