Xiao, K., Huang, Z., & Xie, R. (2026). Interpretable Feature Based Machine Learning for Automatic Sleep Detection Using Photoplethysmography: A Cross Disciplinary Approach to Health Management. Big.D, 2(1), 1–9. https://doi.org/10.64504/big.d.v2i1.149 (Original work published January 1, 2025)