Geodesic
Quasi-endomorphism rings of strongly indecomposable torsion-free Abelian groups of rank~4 with pseudosocles of rank~1
Fundamentalʹnaâ i prikladnaâ matematika, Tome 17 (2012) no. 8, pp. 177-182.

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We obtain the matrix representation of the minimal rational algebra whose subalgebras, up to isomorphism, are quasi-endomorphism rings of strongly indecomposable torsion-free Abelian groups of rank 4 with pseudosocles of rank 1. 
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A. V. Cherednikova. Quasi-endomorphism rings of strongly indecomposable torsion-free Abelian groups of rank~4 with pseudosocles of rank~1. Fundamentalʹnaâ i prikladnaâ matematika, Tome 17 (2012) no. 8, pp. 177-182. http://geodesic.mathdoc.fr/item/FPM_2012_17_8_a17/

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