References

Accessible discussion of system and signal norms is in the slim (and freely downloadable) book [1].

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References

[1]
J. C. Doyle, B. A. Francis, and A. R. Tannenbaum, Feedback Control Theory, Reprint of the 1990 edition by Macmillan Publishing. Dover Publications, 2009. Available: https://www.control.utoronto.ca/people/profs/francis/dft.pdf