@article{HHA_2011_13_1_a1,
     author = {Samson Saneblidze and Ronald Umble},
     title = {Matrads, biassociahedra, and $A_{\infty}$-bialgebras},
     journal = {Homology, homotopy, and applications},
     pages = {1--57},
     publisher = {mathdoc},
     volume = {13},
     number = {1},
     year = {2011},
     doi = {10.4310/HHA.2011.v13.n1.a2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4310/HHA.2011.v13.n1.a2/}
}