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@article{PORMA_1952__11_1_114697, author = {Green, John W.}, title = {On the chords of a convex curve - {II}}, journal = {Portugaliae mathematica}, pages = {51--55}, publisher = {mathdoc}, volume = {11}, number = {1}, year = {1952}, mrnumber = {0051536}, zbl = {0046.16001}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1952__11_1_114697/} }
Green, John W. On the chords of a convex curve - II. Portugaliae mathematica, Tome 11 (1952) no. 1, pp. 51-55. http://geodesic.mathdoc.fr/item/PORMA_1952__11_1_114697/