Best Approximations by Increasing Invariant Subspaces of Self-Adjoint Operators. - Oleh Lopushansky; Renata Tluczek-Pieciak (Symmetry, 2020)

Nonlinear inverse problem of control diffusivity parameter determination for a space-time fractional diffusion equation. - Andriy Lopushansky; Oleh Lopushansky; Serhii Sharyn (Appl. Math. Comput., 2021)