@Article{Xin:2005:IHB,
  author =       "Jianguo Xin and Katia Pinchedez and Joseph E. Flaherty",
  title =        "Implementation of Hierarchical Bases in {Femlab} for Simplicial Elements",
  journal =      "{ACM} Transactions on Mathematical Software",
  volume =       "31",
  number =       "2",
  month =        jun,
  year =         "2005",
  pages =        "187--200",
  URL =          " http://doi.acm.org/10.1145/1067967.1067968",
  abstract =     "We present the implementation of a well-conditioned hierarchical bases 
                 for one-dimensional, triangular and tetrahedral elements in finite element 
                 Femlab software. Using the domain mesh information provided by Femlab, we 
                 found an easy way to maintain the continuity of solutions across the 
                 inter-element boundaries. The conditionings of the global stiffness 
                 matrices of several standard problems are compared with Lagrange bases and 
                 are smaller for all cases.",
}