Bahadorpour, Mojdeh, Behzad Soleimani Neysiani, and Mohammad Nadimi Shahraki. 2017. “Determining Optimal Number of Neighbors in Item-Based KNN Collaborative Filtering Algorithm for Learning Preferences of New Users”. Journal of Telecommunication, Electronic and Computer Engineering (JTEC) 9 (3):163-67. https://jtec.utem.edu.my/jtec/article/view/1548.