1. Kapustin, N.Yu., On a Spectral Problem in the Theory of the Heat Operator, Differ. Uravn., 2009, vol. 45, no. 10, pp. 1509–1511.
2. Kapustin, N.Yu., On the Uniform Convergence of Fourier Series for a Spectral Problem with Squared Spectral Parameter in a Boundary Condition, Differ. Uravn., 2010, vol. 46, no. 10, pp. 1504–1507.
3. Kapustin, N.Yu. and Moiseev, E.I., On a Spectral Problem with Spectral Parameter in a Boundary Condition, Differ. Uravn., 1997, vol. 33, no. 1, pp. 115–119.
4. Moiseev, E.I. and Kapustin, N.Yu., On the Basis Property in the Space L p of Systems of Eigenfunctions Corresponding to Two Problems with Spectral Parameter in the Boundary Condition, Differ. Uravn., 2000, vol. 36, no. 10, pp. 1357–1360.
5. Moiseev, E.I. and Kapustin, N.Yu., Convergence of Spectral Expansions of Functions in the Hölder Class for Two Problems with Spectral Parameter in the Boundary Condition, Differ. Uravn., 2000, vol. 36, no. 8, pp. 1069–1074.