The centers of gravity of the associahedron and of the permutahedron are the same.
Hohlweg, Christophe ; Lortie, Jonathan ; Raymond, Annie
The Electronic Journal of Combinatorics [electronic only], Tome 17 (2010), / Harvested from The Electronic Library of Mathematics
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Publié le : 2010-01-01
EUDML-ID : urn:eudml:doc:227788 
@article{05721466,
     title = {The centers of gravity of the associahedron and of the permutahedron are the same.},
     journal = {The Electronic Journal of Combinatorics [electronic only]},
     volume = {17},
     year = {2010},
     zbl = {1225.05246},
     language = {en},
     url = {http://dml.mathdoc.fr/item/05721466}
}

Hohlweg, Christophe; Lortie, Jonathan; Raymond, Annie. The centers of gravity of the associahedron and of the permutahedron are the same.. The Electronic Journal of Combinatorics [electronic only], Tome 17 (2010) . http://gdmltest.u-ga.fr/item/05721466/