Virtual Labs

Tools

Z-Transform

Signals and Systems, 2nd Edition, Prentice Hall, Oppenheim, Willsky and Nawab
Digital Signal Processing: Principles, Algorithms, and Applications by Dimitris Manolakis and John G. Proakis
https://en.wikipedia.org/wiki/Z-transform
https://en.wikipedia.org/wiki/Causal_system
https://en.wikibooks.org/wiki/Control_Systems/Stability