Affiliation: | (1) University of Hamburg, Institute of Applied Mathematics, Bundesstrasse 55, D-20146 Hamburg, Germany, e-mail: kanzow@math.uni-hamburg.de, DE;(2) Chinese Academy of Sciences, Institute of Computational Mathematics and Scientific/Engineering Computing, P.O. Box 2719, Beijing, China, e-mail: qhd@lsec.cc.ac.cn, CN |