- S. I. Adian, V. S. Atabekyan, “n-torsion Groups”, J. Contemp. Mathemat. Anal., 54, № 6, 2019,
319 
- A. L. Gevorgyan, G. G. Gevorgyan, “Finite Subgroups of the Relatively Free
$\boldsymbol{n}$ -Torsion Groups”, J. Contemp. Mathemat. Anal., 55, № 1, 2020,1