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On groups, whose non-normal subgroups are either contranormal or core-free ^{1}Kurdachenko LA, ^{1}Pypka AA, ^{2}Subbotin IYa. On groups, whose non-normal subgroups are either contranormal or core-free. 2020 ;(10):3-8.

Derivations and automorphisms of locally matrix algebras and groups Bezushchak OO. Derivations and automorphisms of locally matrix algebras and groups. 2020 ;(9):19-23.

About a practical method of determining the length of an ellipse Ustyanich EP, Ustyanich AE. About a practical method of determining the length of an ellipse. 2020 ;(9):10-18.

The generalized Hermite polynomials, their properties, and the differential equation which they satisfy ^{1}Makarov VL. The generalized Hermite polynomials, their properties, and the differential equation which they satisfy. 2020 ;(9):3-9.

Logarithmic capacity and Riemann and Hilbert problems for generalized analytic functions ^{1}Gutlyanskii VYa., ^{1}Nesmelova OV, ^{1}Ryazanov VI, ^{2}Yefimushkin AS. Logarithmic capacity and Riemann and Hilbert problems for generalized analytic functions. 2020 ;(8):11-18.

Elliptic problems with nonclassical coundary conditions in an extended Sobolev scale ^{1}Murach AA, ^{1}Chepurukhina IS. Elliptic problems with nonclassical coundary conditions in an extended Sobolev scale. 2020 ;(8):3-10.

On the structure of Leibniz algebras, whose subalgebras are ideals or core-free ^{1}Chupordia VA, ^{1}Kurdachenko LA, ^{2}Semko NN. On the structure of Leibniz algebras, whose subalgebras are ideals or core-free. 2020 ;(7):17-21.

Multi-interval dissipative Sturm–Liouville boundary-value problems with distributional coefficients ^{1}Goriunov AS. Multi-interval dissipative Sturm–Liouville boundary-value problems with distributional coefficients. 2020 ;(7):10-16.

Higher-order differential equations with polynomial solutions associated with classical orthogonal polynomials ^{1}Makarov VL. Higher-order differential equations with polynomial solutions associated with classical orthogonal polynomials. 2020 ;(7):3-9.