Department of Mathematical Sciences
Norwegian University of Science and Technology
Alfred Getz vei 1 NO-7491 Trondheim, NORWAY
E-mail: holden"@"math.ntnu.no
Centre of Mathematics for Applications
University of Oslo, Norway
P.O. Box 1053, Blindern, NO-0316 Oslo, Norway
E-mail: kennethk"@"math.uio.no
SINTEF ICT, Department of Applied Mathematics, Norway
P.O.Box 124 Blindern, N-0314 Oslo
E-mail: Knut-Andreas.Lie"@"sintef.no
Centre of Mathematics for Applications
University of Oslo
P.O. Box 1053, Blindern, NO-0316 Oslo, Norway
E-mail: nilshr"@"math.uio.no