@article{10_2140_agt_2006_6_839,
     author = {Bux, Kai-Uwe and Wortman, Kevin},
     title = {A geometric proof that {SL2(\ensuremath{\mathbb{Z}}[t,t\ensuremath{-}1])} is not finitely presented},
     journal = {Algebraic and Geometric Topology},
     pages = {839--852},
     year = {2006},
     volume = {6},
     number = {2},
     doi = {10.2140/agt.2006.6.839},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2006.6.839/}
}