@article{JAC_2014__40_3_a2,
     author = {Lee, Kyungyong and Li, Li and Zelevinsky, Andrei},
     title = {Positivity and tameness in rank 2 cluster algebras},
     journal = {Journal of Algebraic Combinatorics},
     pages = {823--840},
     publisher = {mathdoc},
     volume = {40},
     number = {3},
     year = {2014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JAC_2014__40_3_a2/}
}