Kumar, Dr. Arun HS, Annie Lin, Luc Maguire, and David Kilroy. “The Utility of Iris-Pupillary Area Ratio As a Non-Invasive Index of Stress in Primates”. Biology, Engineering, Medicine and Science Reports 4, no. 1 (January 1, 2018): 20–22. Accessed July 24, 2024. https://bemsreports.org/index.php/bems/article/view/68.