Theoretical Computer ScienceVolume 378, Issue 3, 9 June 2007, Pages 209-210PrefaceAuthor links open overlay panelZhi-Zhong Chen, Xiaotie Deng, Ding-zhu DuShow moreShareCitehttps://doi.org/10.1016/j.tcs.2007.02.030Get rights and contentUnder an Elsevier user licenseopen archivePrevious article in issueNext article in issueRecommended articlesCited by (0)Copyright © 2007 Elsevier Ltd. All rights reserved.