@article{PORMA_1974__33_3_115229,
     author = {Downing, J.R. and White, A.G.},
     title = {Note on extremal points},
     journal = {Portugaliae mathematica},
     pages = {137--140},
     publisher = {mathdoc},
     volume = {33},
     number = {3},
     year = {1974},
     mrnumber = {0358579},
     zbl = {0295.52011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1974__33_3_115229/}
}