@article{DCG_1988__3_1-2_131053,
     author = {J. Lawrence},
     title = {Valuations and {Polarity.}},
     journal = {Discrete & computational geometry},
     pages = {307--324},
     publisher = {mathdoc},
     volume = {3},
     number = {1-2},
     year = {1988},
     zbl = {0646.52003},
     url = {http://geodesic.mathdoc.fr/item/DCG_1988__3_1-2_131053/}
}