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file links.html for pointers to related resources in netlib lib mgghat for 2D elliptic partial differential equations on polygonal domains alg adaptive refinement and multigrid using linear, quadratic or cubic elements by William F. Mitchell ref SIAM J. Sci. Statist. Comput. 13, 1992, pp. 146-167. gams I2b1a prec single real age research lang mostly FORTRAN 77, some C see many related packages at ftp://na.cs.yale.edu/mgnet file claw.html for clawpack: hyperbolic systems of conservation laws by Randall J. LeVeque <rjl@amath.washington.edu> file petsc.html for elliptic partial differential equations alg preconditioned Krylov Newton; MPI by Balay, Gropp, McInnes, Smith contact petsc-maint@mcs.anl.gov lang C; callable from Fortran; compilable as C++ prec double, doublecomplex age research keywords parallel sparse matrices, sequential sparse , direct solvers, parallel matrix assembly, trust region methods, , line search methods, iterative methods lib multipole for multipole methods and supporting infrastructure file ani2d.tgz for anisotropic adaptive grid generation by Konstantin Lipnikov and Yuri Vasilevski alg inertia bisection, local modification, error estimators, discrete boundaries ref Comput. Methods Appl. Mech. Engrg., V.192, 2003,1495-1513 lang Fortran77