On the metric complexity of casual linear systems: ε -Entropy and ε -Dimension for continuous time

Feedback Systems: Input-Output Properties

1975 • 3,239 citations

Theory of Approximation of Functions of a Real Variable

1963 • 1,480 citations

Bounds for Truncation Error of the Sampling Expansion

1966 • 128 citations

Adaptive feedback, identification and complexity: an overview

2002 • 20 citations

Elements of the Theory of Functions.

1967 • 15 citations

The ε-capacity of classes of unknown channels

1969 • 9 citations