From other sources. See the preface in Notes on the associator [pdf].
Jean-Louis Loday / Images (archived home page): Polytope de Stasheff (associahedron) de dimension 4, version cubique (mars 2002).
Loday, Jean-Louis. The diagonal of the Stasheff polytope. Higher structures in geometry and physics, 269-292. Progr. Math., 287, 2011. MR 2762549.
Loday, Jean-Louis. Dichotomy of the addition of natural numbers. Associahedra, Tamari lattices and related structures, 65-79. Progr. Math., 299, 2012. MR 3221534.
Saneblidze, Samson; Umble, Ronald. Diagonals on the permutahedra, multiplihedra and associahedra. Homology Homotopy Appl. 6 (2004), no. 1, 363-411. MR 2118493.
Saneblidze, Samson; Umble, Ronald. Comparing diagonals on the associahedra Homology Homotopy Appl. 26 (2024), no. 1, 141-149. MR 4723091.
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