@Article{SCI:Ber2004b,
  author =    "M. Berzins",
  title =     "Variable Order Finite Elements and Positivity
              Preservation for Hyperbolic PDEs",
  journal =   "Applied Numerical Mathematics",
  volume =    "48",
  number =    "3-4",
  pages =     "253--439",
  year =      "2004",
  month =     "March",
  keywords =  "forward problems inverse problems forward
              simulation inverse solutions, finite elements,
              computational pde pdes computational partial
              differential equations",
  url =       "http://www.sci.utah.edu/publications/berzins04/HPhyp.pdf",
}