@article {IOPORT.50230666,
    author       = {Morvan, Jean-Marie and Thibert, Boris},
    title        = {Approximation of the normal vector field and the area of a smooth surface},
    year         = {2004},
    journal      = {Discrete & Computational Geometry},
    volume       = {32},
    number       = {3},
    pages        = {383-400},
    identifier   = {50230666},
}