Some optimal error estimates for piecewise linear finite element approximations. Rannacher, R. & Scott, R. Math. Comp., 38:437--445, 1982.
bibtex   
@Article{RSM:Ran82,
  author =       "R. Rannacher and R. Scott",
  title =        "Some optimal error estimates for piecewise linear
                 finite element approximations",
  journal =      "Math. Comp.",
  year =         "1982",
  volume =       "38",
  pages =        "437--445",
}

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