Geodesic
Automorphisms of semigroups of invertible matrices with nonnegative integer elements
Sbornik. Mathematics, Tome 203 (2012) no. 9, pp. 1342-1356

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Let $G_n(\mathbb Z)$ be the subsemigroup of $\operatorname{GL}_n(\mathbb Z)$ consisting of the matrices with nonnegative integer coefficients. In the paper, the automorphisms of this semigroup are described for $n\geqslant 2$. Bibliography: 5 titles.
Keywords: matrices with nonnegative coefficients, automorphisms, integers. 
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     author = {P. P. Semenov},
     title = {Automorphisms of semigroups of invertible matrices with nonnegative integer elements},
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     url = {http://geodesic.mathdoc.fr/item/SM_2012_203_9_a5/}
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P. P. Semenov. Automorphisms of semigroups of invertible matrices with nonnegative integer elements. Sbornik. Mathematics, Tome 203 (2012) no. 9, pp. 1342-1356. http://geodesic.mathdoc.fr/item/SM_2012_203_9_a5/