1. Chekhlov A. R., “On the projective commutant of abelian groups,” Siberian Math. J., 53, No. 2, 360–370 (2012).
2. Tuganbaev A. A., Ring Theory. Arithmetic Modules and Rings [in Russian], MTsNMO, Moscow (2009).
3. Chekhlov A. R., “Abelian groups with normal endomorphism rings,” Algebra and Logic, 48, No. 4, 298–308 (2009).
4. Krylov P. A., Mikhalev A. V., and Tuganbaev A. A., Endomorphism Rings of Abelian Groups [in Russian], Faktorial Press, Moscow (2007).
5. Chekhlov A. R., “E-Engel abelian groups of degree - 2,” Vestnik Tomsk Gos. Univ. Math. Mekh., No. 1, 54–60 (2012).