“…In certain cases, boundary conditions are more complicated and deviations are of mixed type (i. e., equations involve both retarded and advanced terms [7,8] or deviations of neither type), which in particular, makes impossible to apply the method of steps due to the absence of the Volterra property of the corresponding operator. The aim of this paper is to show that the techniques suggested in [9] for boundary value problems for ordinary differential equations, under certain assumptions, can be adopted for application to functional differential equations covering, in particular, the case of deviations of mixed type and general boundary conditions.…”