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

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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 $2$. 
@article{FPM_2015_20_5_a18,
     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~$2$},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {209--225},
     publisher = {mathdoc},
     volume = {20},
     number = {5},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2015_20_5_a18/}
}
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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/