Dr. Hang Si

Research Group "Numerical Mathematics and Scientific Computing"   address: Weierstrass Institute for Applied Analysis and Stochastics Dr. Hang Si Mohrenstrasse 39 10117 Berlin Germany   office: Mohrenstrasse 39, room 302 tel: ++49 (0) 30 20372 446 fax: ++49 (0) 30 2044975 e-mail: Hang.Si-please remove this text-@wias-berlin.de         WIAS preprints and reports