- Estimating the transfer function between the CAP and radial EBI cardiac periods : use of PCA for dominating spectral features analysisKrivošei, Andrei; Uuetoa, Hasso; Min, Mart; Lamp, Jürgen; Annus, Paul; Uuetoa, TiinaInternational journal of bioelectromagnetism2015 / p. 31-35 : ill