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Google AI: The physics of woodpecker toy
Kulaga I. (2022). Explaining Physics With the Help of Toys. World Scientific Pub., doi.org/10.1142/12827
Pattyson W. D. C. (1886). Toy. Patent N. 350766, patents.google.com/patent/US350766A
Fisica per tutti: The Woodpecker, dydaktyka.fizyka.umk.pl/zabawki1/files/mech/dzieciol_big-en.html
github.com: Woodpecker, github.com/gabyx/Woodpecker
University of Stuttgart: Nonlinear Dynamics of Wooden Toys (a cura di R. Leine, C. Glocker) www.inm.uni-stuttgart.de/einzelprojekte/toys/woodentoys/
WikipediA: Contact dynamics, en.wikipedia.org/wiki/Contact_dynamics
YouTube: Woodpecker on Pole, youtu.be/s3YSnNAIHDg