1. Existence and regularity for linear delay partial differential equations
2. Delay Differential Equations and Applications, Editors by O. Arino, M.L. Hbid and E. Ait Dads (Springer, Berlin, 2006).
3. G. Di Blasio, Nonlinear Analysis: Theory, Method & Applications 52(2) (2003).
4. V.V. Vlasov and N.A. Rautian, Spectral Analysis of Functional Differential Equations (MAKS Press, Moscow, 2016). (Russian).
5. A.L. Skubachevskii, Doklady Akademii Nauk 335(2), 157–160 (1994).