%0 Journal Article %A Alexander Lazar %T A chip-firing game on the product of two graphs and the tropical Picard group %J The electronic journal of combinatorics %D 2017 %V 24 %N 4 %U http://geodesic.mathdoc.fr/articles/10.37236/5533/ %R 10.37236/5533 %F 10_37236_5533