Convex sets in projective space
Compositio Mathematica, Tome 13 (1956-1958), pp. 113-118. 
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     author = {de Groot, J. and de Vries, H.},
     title = {Convex sets in projective space},
     journal = {Compositio Mathematica},
     pages = {113--118},
     publisher = {Kraus Reprint},
     volume = {13},
     year = {1956-1958},
     mrnumber = {92167},
     zbl = {0080.15402},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1956-1958__13__113_0/}
}
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de Groot, J.; de Vries, H. Convex sets in projective space. Compositio Mathematica, Tome 13 (1956-1958), pp. 113-118. http://archive.numdam.org/item/CM_1956-1958__13__113_0/

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D. Dekker [4] Convex regions in projective space, The Amer. Math. Monthly, 62, no. 6, p. 430-431, (1955). | Zbl