The electrode system in impedance-based ventilation measurement. - Shen Luo; Valtino X. Afonso; John G. Webster; Willis J. Tompkins (IEEE Trans. Biomed. Eng., 1992)

ECG beat detection using filter banks. - Valtino X. Afonso; Willis J. Tompkins; Truong Q. Nguyen; Shen Luo (IEEE Trans. Biomed. Eng., 1999)