The total length of the edges of a polyhedron
Compositio Mathematica, Tome 9 (1951) , pp. 239-240.
@article{CM_1951__9__239_0,
     author = {Hammersley, J. M.},
     title = {The total length of the edges of a polyhedron},
     journal = {Compositio Mathematica},
     pages = {239--240},
     publisher = {Kraus Reprint},
     volume = {9},
     year = {1951},
     zbl = {0043.37504},
     mrnumber = {46668},
     language = {en},
     url = {www.numdam.org/item/CM_1951__9__239_0/}
}
Hammersley, J. M. The total length of the edges of a polyhedron. Compositio Mathematica, Tome 9 (1951) , pp. 239-240. http://www.numdam.org/item/CM_1951__9__239_0/