“A Robust PPG Heart Rate Estimation Network Based on Frequency-Domain NLMS and Dual-Stream Hierarchical Self-Attention” (2026) International Conference on Energy, Intelligence Systems, and Cloud Computing (Ingenio 2026), 1(1). Available at: https://ingeniot.uclm.es/editorial/index.php/ingenio26/article/view/31 (Accessed: 15 July 2026).