@article{MOMA_1955__59_176979,
     author = {C.M. Petty and D. Waterman},
     title = {An {Extremal} {Theorem} for {N-Simplexes.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {320--322},
     publisher = {mathdoc},
     volume = {59},
     year = {1955},
     zbl = {0066.14401},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1955__59_176979/}
}