1. Über Differentialungleichungen;Bohl;J. Reine Angew. Math.,1913
2. Stability of Solutions of Differential Equations in Banach Spaces;Daleckiiˇ,1974
3. Linear Differential Equations and Function Spaces;Massera,1996
4. Differential Equations: Stability, Oscillations, Time Lag;Halanay,1966
5. A perturbation-accumulation problem for linear differential equations with time-lag;Tyshkevich;Differ. Equ.,1978