@article{10_4171_ggd_43,
     author = {Udo Baumgartner and Jacqui Ramagge and Bertrand R\'emy},
     title = {Contraction groups in complete {Kac{\textendash}Moody} groups},
     journal = {Groups, geometry, and dynamics},
     pages = {337--352},
     year = {2008},
     volume = {2},
     number = {3},
     doi = {10.4171/ggd/43},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/43/}
}