doi:10.1016/S0166-218X(03)00193-8
Copyright © 2003 Elsevier B.V. All rights reserved.
Jianer Chena, b, Yanpei Liuc, Suowang Chend and Songqiao Chena
a Department of Computer Science, Central South University, ChangSha, Hunan 410083, People's Republic of China
b Department of Computer Science, Texas A&M University, College Station, TX 77843, USA
c Department of Mathematics, Northern Jiaotong University, Beijing 100044, People's Republic of China
d Department of Computer Science, National University of Defense Technology, ChangSha, Hunan 410073, People's Republic of China
Available online 27 August 2003.