1. On the asymptotic behaviour of solutions of linear differential equations of the second order with retarded argument;Kamenskii;Moskov. Gos. Univ. Uć. Zap.,1954
2. On boundary problem of Sturm–Liouville type for second-order differential equation with retarded argument;Norkin;Izv. Vysś. Ućebn. Zaved. Matematika,1958
3. Expansion in eigenfunctions of some non-selfadjoint boundary problems;Nersesjan;Sibirsk. Mat Ź.,1961
4. On boundary value problems for differential equations with retarded argument;Jablonski;Univ. Iagellonce Acta Math. Iss.,1987
5. On differential equations with retarded argument;Demidenko;Sib. Mat. Zh.,2005