Minfen Shen Jialiang Chen Patch Beadle Analysis of Time-Varying EEG Based on Wavelet Packet Entropy. 21-28 2009 ISNN (1) http://dx.doi.org/10.1007/978-3-642-01507-6_3 conf/isnn/2009-1 db/conf/isnn/isnn2009-1.html#ShenCB09