1. Department of Mathematics, Texas A&M University, College Station, Tx., U.S.A.
2. Department of Mathematics, Chinese University of Hong Kong, Shatin, N.T., Hong Kong
3. Department of Mathematics & Institute for Scientific Computation (ISC), Texas A&M University, College Station, Tx., U.S.A.
4. Institute of Computational Engineering and Sciences, University of Texas, Austin, Tx., U.S.A.
5. Institute for Scientific Computation, Texas A&M University, College Station, Tx., U.S.A.; and Department of Computational Technologies, North-Eastern Federal University, Yakutsk, Republic of Sakha (Yakutia), Russia