Krein Space.- Optimal Estimation for Systems with Measurement Delays.- Optimal Control for Systems with Input/Output Delays.- H? Estimation for Discrete-Time Systems with Measurement Delays.- H? Control for Discrete-Time Systems with Multiple Input Delays.- Linear Estimation for Continuous-Time Systems with Measurement Delays.- H? Estimation for Systems with Multiple State and Measurement Delays.- Optimal and H? Control of Continuous-Time Systems with Input/Output Delays.