@article{HHA_2009_11_1_a8,
     author = {Terrence Bisson and Aristide Tsemo},
     title = {A homotopical algebra of graphs related to zeta series},
     journal = {Homology, homotopy, and applications},
     pages = {171--184},
     publisher = {mathdoc},
     volume = {11},
     number = {1},
     year = {2009},
     doi = {10.4310/HHA.2009.v11.n1.a8},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4310/HHA.2009.v11.n1.a8/}
}