Liu, J., C. Shen, L. Zhao, T. Maeda, and J. Cao. “Detection of Deep Sleep Stages in Multi-Channel EEG Signals Based on Spectral Feature Quantification Methods”. INTERNATIONAL JOURNAL OF COMPUTERS &Amp; TECHNOLOGY, vol. 25, Nov. 2025, pp. 70-87, doi:10.24297/ijct.v25i.9809.