@article{CunoLehnert2015,
  author    = {Johannes Cuno and J{\"o}rg Lehnert},
  title     = {The Tits alternative for non-spherical triangles of groups},
  journal   = {Transactions of the London Mathematical Society, 2.2015, S. 93-124},
  volume    = {2},
  number    = {1},
  pages     = {93 -- 124},
  doi       = {10.1112/tlms/tlv005},
  url       = {http://tlms.oxfordjournals.org/content/2/1/93.full.pdf},
  year      = {2015},
}