LUGR:

References:

• A Comparison between Direct and Iterative Methods to Solve the Linear Systems arising from a Time-dependent 2D Groundwater Flow Model,
  J.G. Blom,J.G. Verwer and R.A. Trompert
  Int. J. Comp. Fluid Dynamics, Vol. 1, pp. 95-113 (1993)
• Computing Brine Transport in Porous Media with an Adaptive-Grid Method
  R.A. Trompert, J.G. Verwer and J.G. Blom
  Int. J. Numer. Meth. in Fluids,Vol. 16, pp. 43-63 (1993).
• Local-uniform-grid refinement and transport in heterogeneous porous media
  R.A. Trompert
  Advances in Water Resources, Vol. 16, pp. 293-304 (1993).
• VLUGR2: A Vectorizable Adaptive Grid Solver for PDEs in 2D,
  J.G. Blom, R.A. Trompert and J.G. Verwer
  Report NM-R9403, CWI, Amsterdam (1994).
• VLUGR3: A Vectorizable Adaptive Grid Solver for PDEs in 3D.
  I. Algorithmic Aspects and Applications,
  J.G. Blom and J.G. Verwer
  Appl. Numer. Math., Vol. 16, pp. 129-156 (1994).
  CWI Report NM-R9404.