1. Polynomials and linear control systems;Barnett,1983
2. Differential difference equations;Bellman,1963
3. On computing the maximal delay intervals for stability of linear delay systems;Chen;IEEE Transactions on Automatic Controls,1995
4. On zeroes of some transcendental equations;Cooke;Funkcialaj Ekvacioj,1986
5. Differential equations: stability, oscillations, time lags;Halanay,1966