Geodesic
Automorphisms of the Semigroup of Nonnegative Invertible Matrices of Order Two over Partially Ordered Commutative Rings
Matematičeskie zametki, Tome 91 (2012) no. 1, pp. 3-11

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In the paper, the automorphisms of the semigroup of nonnegative invertible matrices of order two over a partially ordered commutative ring with $2$ invertible are described.
Keywords: associative (commutative) ring with unit, nonnegative invertible matrix of order two, partially ordered commutative ring, subsemigroup, central homomorphism of semigroups, idempotent. 
E. I. Bunina. Automorphisms of the Semigroup of Nonnegative Invertible Matrices of Order Two over Partially Ordered Commutative Rings. Matematičeskie zametki, Tome 91 (2012) no. 1, pp. 3-11. http://geodesic.mathdoc.fr/item/MZM_2012_91_1_a0/
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