Hoshmand, Hedayatullah, and Sandeep Singh Kang. “Null Function Classification Using NFR Matrix and Decision Tree”. International Journal of Engineering and Technology 7, no. 3 (June 23, 2018): 1087–1090. Accessed May 12, 2025. https://mail.sciencepubco.com/index.php/IJET/article/view/12495.