@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}, 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}, }