Wong, Wai Kit, Gin Chong Lee, Chu Kiong Loo, and Raymond Lock. “Quaternion Based Fuzzy Neural Network Classifier for MPIK Dataset’s View-Invariant Color Face Image Recognition ”. Informatica 37, no. 2. Accessed August 9, 2025. https://puffbird.ijs.si/index.php/informatica/article/view/448.