@article {IOPORT.00821348,
    author       = {Barr\'e, Sylvain},
    title        = {Two-dimensional finite non-positively curved polyhedra of rank two. (Poly\`edres finis de dimension 2 \`a courbure $\leq 0$ et de rang 2.)},
    year         = {1995},
    journal      = {Annales de l'Institut Fourier},
    volume       = {45},
    number       = {4},
    issn         = {0373-0956},
    pages        = {1037-1059},
    publisher    = {Universit\'e Joseph Fourier, Grenoble; Association des Annales de l'Institut Fourier, Saint-Martin d'H\`eres},
    doi          = {10.5802/aif.1483},
    abstract     = {Summary: We locally define the notion of polyhedra of rank two for two-dimensional finite non-positively curved polyhedra. We prove that the universal covering of such a space is either the product of two trees or an Euclidean Tits building of rank two.},
    identifier   = {00821348},
}