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Dirac delta function - Wikipedia
The Unit Impulse Function - Swarthmore College
6.5: Impulse functions - Mathematics LibreTexts
5.4: Step and Impulse Functions - Mathematics LibreTexts
6.4: Dirac Delta and Impulse Response - Mathematics LibreTexts
Impulse Function - an overview | ScienceDirect Topics
Impulse (physics) - Wikipedia
1.6: Continuous Time Impulse Function - Engineering LibreTexts