no. 1
On order and metric convexities in Z n
Compositio Mathematica, Tome 82 (1992) no. 1, pp. 57-65. 
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     title = {On order and metric convexities in $Z^n$},
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     number = {1},
     year = {1992},
     mrnumber = {1154161},
     zbl = {0758.52010},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1992__82_1_57_0/}
}
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Changat, M.; Vijayakumar, A. On order and metric convexities in $Z^n$. Compositio Mathematica, Tome 82 (1992) no. 1, pp. 57-65. http://archive.numdam.org/item/CM_1992__82_1_57_0/

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