Lourens Nicolaas Jacobus Engelbrecht. “A New Way of Looking at the Collatz Conjecture”. American Scientific Research Journal for Engineering, Technology, and Sciences 88, no. 1 (May 22, 2022): 91–98. Accessed September 21, 2025. https://www.asrjetsjournal.org/American_Scientific_Journal/article/view/7485.