Chang, Bo Yuan, Mohamed A. Naiel, Steven Wardell, Stan Kleinikkink, and John S. Zelek. “Time-Series Causality With Missing Data”. Journal of Computational Vision and Imaging Systems 6, no. 1 (January 15, 2021): 1–4. Accessed October 27, 2021. https://openjournals.uwaterloo.ca/index.php/vsl/article/view/3552.