@article{MS2_1954__2_165516,
     author = {LENNART SANDGREN},
     title = {On convex cones},
     journal = {Mathematica Scandinavica},
     pages = {19--28},
     publisher = {mathdoc},
     volume = {2},
     year = {1954},
     zbl = {0056.15702},
     url = {http://geodesic.mathdoc.fr/item/MS2_1954__2_165516/}
}