On groups of non-negative matrices
Compositio Mathematica, Tome 21 (1969) no. 4, pp. 376-382. 
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     author = {Flor, Peter},
     title = {On groups of non-negative matrices},
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     pages = {376--382},
     publisher = {Wolters-Noordhoff Publishing},
     volume = {21},
     number = {4},
     year = {1969},
     mrnumber = {257115},
     zbl = {0194.34005},
     language = {en},
     url = {http://www.numdam.org/item/CM_1969__21_4_376_0/}
}
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Flor, Peter. On groups of non-negative matrices. Compositio Mathematica, Tome 21 (1969) no. 4, pp. 376-382. http://www.numdam.org/item/CM_1969__21_4_376_0/

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