@article{CM_1951__9__141_0,
     author = {Schoenberg, I. J. and Whitney, Anne},
     title = {A theorem on polygons in n dimensions with applications to variation-diminishing and cyclic variation-diminishing linear transformations},
     journal = {Compositio Mathematica},
     pages = {141--160},
     publisher = {Kraus Reprint},
     volume = {9},
     year = {1951},
     mrnumber = {42366},
     zbl = {0043.25204},
     language = {en},
     url = {http://www.numdam.org/item/CM_1951__9__141_0/}
}