A. Suryanto
(1), E. van Groesen
(2)
(1)
Jurusan Matematika, Fakultas MIPA, Universitas Brawijaya, Jl Veteran Malang 65145,
Indonesia., Indonesia,
(2)
Applied Analysis and Mathematical Physics, Dept. of Applied Mathematics, University
of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.Applied Analysis and Mathematical Physics, Dept. of Applied Mathematics, University
of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands., Netherlands
