@article{MS2_1979__45_166678,
     author = {Helge Tverberg},
     title = {A seperation property of plane convex sets.},
     journal = {Mathematica Scandinavica},
     pages = {255--260},
     publisher = {mathdoc},
     volume = {45},
     year = {1979},
     zbl = {0421.52004},
     url = {http://geodesic.mathdoc.fr/item/MS2_1979__45_166678/}
}