Warfield's duality and Malcev's matrix
Fundamentalʹnaâ i prikladnaâ matematika, Tome 17 (2012) no. 8, pp. 77-94.

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In this work, we investigate relations between Malcev's matrices of a torsion-free group $G$ of finite rank and Malcev's matrices of groups $\operatorname{Hom}(R,G)$ and $\operatorname{Hom}(G,R)$, where $G$ is a locally free group and $R$ is a torsion-free group of rank 1.
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J. V. Kostromina. Warfield's duality and Malcev's matrix. Fundamentalʹnaâ i prikladnaâ matematika, Tome 17 (2012) no. 8, pp. 77-94. http://geodesic.mathdoc.fr/item/FPM_2012_17_8_a9/

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