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@article {MR2193659, 
   author = {Riikka Kangaslampi and Alina Vdovina},
    title = {Triangular hyperbolic buildings},
     year = {2006},
  journal = {C. R. Math. Acad. Sci.},
   volume = {342},
   number = {2},
    pages = {125--128},
  mrclass = {2006g:52026},
 mrnumber = {MR2193659}
}