Xanthopoulos, P, Golemati S, Sakkalis V, Ktonas PY, Ortigueira M, Zervakis M, Paparrigopoulos T, Tsekou H, Soldatos CR.  2006.  Comparative analysis of time-frequency methods estimating the time-varying microstructure of sleep EEG spindles, October. Information Technology Applications in Biomedicine.