Geodesic
On the quasi-endomorphism rings of quasi-decomposable torsion-free Abelian groups of rank $4$ with a strongly indecomposable quasi-summand of rank $2$
Fundamentalʹnaâ i prikladnaâ matematika, Tome 20 (2015) no. 5, pp. 209-225 
A. V. Cherednikova. On the quasi-endomorphism rings of quasi-decomposable torsion-free Abelian groups of rank $4$ with a strongly indecomposable quasi-summand of rank $2$. Fundamentalʹnaâ i prikladnaâ matematika, Tome 20 (2015) no. 5, pp. 209-225. http://geodesic.mathdoc.fr/item/FPM_2015_20_5_a18/
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     author = {A. V. Cherednikova},
     title = {On the quasi-endomorphism rings of quasi-decomposable torsion-free {Abelian} groups of rank~$4$ with a~strongly indecomposable quasi-summand of rank~$2$},
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Voir la notice de l'article provenant de la source Math-Net.Ru

We obtain a description of quasi-endomorphism rings of torsion-free Abelian groups $G$ of rank $4$ that are quasi-decomposable into a direct sum of groups $A_1$ and $A_2$ of rank $1$ and a strongly indecomposable group $B$ of rank $2$ in the case where the quasi-homomorphism group $\mathbb {Q} \otimes \operatorname{Hom}(B, A_2)$ has rank $2$.

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