@article{NUMA_1968__12_131857,
     author = {C. WITZGALL and R.J.B. WETS},
     title = {Towards an {Algebraic} {Characterization} of {Convex} {Polyhedral} {Cones.}},
     journal = {Numerische Mathematik},
     pages = {134--138},
     publisher = {mathdoc},
     volume = {12},
     year = {1968},
     zbl = {0165.34702},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1968__12_131857/}
}