- D. M. Polyakov, “Asymptotics of the eigenvalues of a two-term fourth-order operator with boundary conditions dependent on the spectral parameter”, Bol. Soc. Mat. Mex., 30, № 2, 2024, 25
- Dmitry M. Polyakov, “Eigenvalue Asymptotics and a Trace Formula for a Fourth-Order Differential Operator”, Complex Anal. Oper. Theory, 17, № 8, 2023, 121