@Article{SCI:Yu97a,
  author =    "F. Yu and Y. Livnat and C.R. Johnson",
  title =     "An Automatic Adaptive Refinement and Derefinement
              Method for 3D Elliptic Problems",
  journal =   "Applied Numerical Mathematics",
  year =      "1997",
  url =       "http://www.sci.utah.edu/publications/yu97/adaptive_paper.pdf",
}