@article{JAC_2015__42_4_a1,
     author = {Grabowski, Jan E.},
     title = {Graded cluster algebras},
     journal = {Journal of Algebraic Combinatorics},
     pages = {1111--1134},
     publisher = {mathdoc},
     volume = {42},
     number = {4},
     year = {2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JAC_2015__42_4_a1/}
}