@article{10_4153_CJM_2016_022_6,
     author = {Hartglass, Michael},
     title = {Free {Product} {C*-algebras} {Associated} with {Graphs,} {Free} {Differentials,} and {Laws} of {Loops}},
     journal = {Canadian journal of mathematics},
     pages = {548--578},
     year = {2017},
     volume = {69},
     number = {3},
     doi = {10.4153/CJM-2016-022-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2016-022-6/}
}