1. Theory of Functional-Differential Equations;Hale,1977
2. Linear Differential Equations with a Delay Argument;Myshkis,1972
3. Second Order Differential Equations with a Delay Argument;Norkin,1965
4. On the solvability and properties of solutions of functional-differential equations in a Hilbert space;Vlasov;Mat. Sb.,1995
5. Determination of a Sturm–Liouville-type differential operator with delay argument from two spectra;Pikula;Mat. Vesnik,1991