Nazim B. Kerimov, Mansur I. Ismailov, “An inverse coefficient problem for the heat equation in the case of nonlocal boundary conditions”, Journal of Mathematical Analysis and Applications, 2012
Mark M. Malamud, Leonid L. Oridoroga, “On the completeness of root subspaces of boundary value problems for first order systems of ordinary differential equations”, Journal of Functional Analysis, 2012
Djakov P. Mityagin B., “Criteria for Existence of Riesz Bases Consisting of Root Functions of Hill and 1D Dirac Operators”, J. Funct. Anal., 263:8 (2012), 2300–2332
Djakov P. Mityagin B., “Equiconvergence of Spectral Decompositions of 1D Dirac Operators with Regular Boundary Conditions”, J. Approx. Theory, 164:7 (2012), 879–927
Djakov P., Mityagin B., “Unconditional Convergence of Spectral Decompositions of 1D Dirac Operators with Regular Boundary Conditions”, Indiana Univ. Math. J., 61:1 (2012), 359–398
Oktay A. Veliev, “On the basis property of the root functions of differential operators with matrix coefficients”, Centr. Eur. J. Math., 2011
Djakov P.B., Mityagin B.S., “Convergence of spectral decompositions of Hill operators with trigonometric polynomial potentials”, Doklady Mathematics, 83:1 (2011), 5–7
Fritz Gesztesy, Helge Holden, “The damped string problem revisited”, Journal of Differential Equations, 2011
Gerhard Freiling, “On the behaviour of eigenfunction expansions in the complex domain”, Proceedings of the Royal Society of Edinburgh: Section A Mathematics, 104:1-2 (2011), 73
Djakov P., Mityagin B., “Convergence of spectral decompositions of Hill operators with trigonometric polynomial potentials”, Math Ann, 351:3 (2011), 509–540