@article{10_4153_CMB_1967_065_x,
     author = {Peterson, Bruce B.},
     title = {Formal {Contraction} of the {N-Simplex}},
     journal = {Canadian mathematical bulletin},
     pages = {659--664},
     year = {1967},
     volume = {10},
     number = {5},
     doi = {10.4153/CMB-1967-065-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1967-065-x/}
}