@article{10_4153_CMB_2006_033_3,
     author = {Balser, Andreas},
     title = {Polygons with {Prescribed} {Gauss} {Map} in {Hadamard} {Spaces} and {Euclidean} {Buildings}},
     journal = {Canadian mathematical bulletin},
     pages = {321--336},
     year = {2006},
     volume = {49},
     number = {3},
     doi = {10.4153/CMB-2006-033-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2006-033-3/}
}