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. and Moiseev, E.I., On Spectral Problems with Spectral Parameter in a Boundary Condition, Differ. Uravn., 1997, vol. 33, no. 1, pp. 115–119.
3. Moiseev, E.I. and Kapustin, N.Yu., On the Basis Property in the Space Lp of Systems of Eigenfunctions Corresponding to Two Problems with Spectral Parameter in a Boundary Condition, Differ. Uravn., 2000, vol. 36, no. 10, pp. 1357–1360.
4. Moiseev, E.I. and Kapustin, N.Yu., Convergence of Spectral Expansions of Hölder Functions for Two Problems with Spectral Parameter in a Boundary Condition, Differ. Uravn., 2000, vol. 36, no. 8, pp. 1069–1074.