1. Linearized oscillations for equations with positive and negative coefficients
2. Linearized oscillations for even-order neutral differential equations
3. and , Oscillation Theory of Delay Differential Equations with Applications, Clarendon Press, Oxford, 1991
4. Linearized Oscillations for Neutral Equations, Differential Equation, Proceedings of the 1987 Equadiff Conference, Dekker, New York, pp. 379–387
5. Linearized oscillations for odd-order neutral delay differential equations