https://ro.wikipedia.org/wiki/Recursivitate
https://adi.ro/pub/scoala/An%20III/Sem%20I/SD/Documentatie/Recursiv-DI.pdf
https://bigfoot.cs.upt.ro/~cami/upc/capitol10.html
https://nemiram.ro/recursivitate/film.html
https://bigfoot.cs.upt.ro/~marius/curs/upc/curs15.pdf
https://informaticasite.ro/recursivitate.html
https://infoscience.3x.ro/c++/recursivitate.htm
https://recursivedrawing.com
https://upload.wikimedia.org/wikipedia/commons/2/20/Tower_of_Hanoi_recursion_SMIL.svg