TY  - JOUR
AU  - G. Dupont
TI  - Positivity in coefficient-free rank two cluster algebras.
JO  - The electronic journal of combinatorics
PY  - 2009
VL  - 16
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.37236/187/
DO  - 10.37236/187
ID  - 10_37236_187
ER  -