The external vertices conjecture in case n=4.
Drury, S.W.
ELA. The Electronic Journal of Linear Algebra [electronic only], Tome 11 (2004), p. 180-191 / Harvested from The Electronic Library of Mathematics
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Publié le : 2004-01-01
EUDML-ID : urn:eudml:doc:125641 
@article{02144311,
     title = {The external vertices conjecture in case },
     journal = {ELA. The Electronic Journal of Linear Algebra [electronic only]},
     volume = {11},
     year = {2004},
     pages = {180-191},
     zbl = {1082.15012},
     language = {en},
     url = {http://dml.mathdoc.fr/item/02144311}
}

Drury, S.W. The external vertices conjecture in case . ELA. The Electronic Journal of Linear Algebra [electronic only], Tome 11 (2004) pp. 180-191. http://gdmltest.u-ga.fr/item/02144311/