Geodesic
Self-small $\mathrm{SP}$-groups with clean endomorphism rings
Fundamentalʹnaâ i prikladnaâ matematika, Tome 20 (2015) no. 5, pp. 141-148.

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In this work, some aspects of cleanness of endomorphism rings of $\mathrm{SP}$-groups are considered. These groups form one of the classes of mixed Abelian groups. The cleanness of endomorphism rings of self-small $\mathrm{SP}$-groups is proved. Some sufficient conditions are found for the converse proposition to hold. 
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K. S. Sorokin. Self-small $\mathrm{SP}$-groups with clean endomorphism rings. Fundamentalʹnaâ i prikladnaâ matematika, Tome 20 (2015) no. 5, pp. 141-148. http://geodesic.mathdoc.fr/item/FPM_2015_20_5_a13/

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