BTI360 | What I've Learned in 45 Years in the Software Industry
https://www.bti360.com/what-ive-learned-in-45-years-in-the-software-industry/How recursion got into programming: a tale of intrigue, betrayal, and advanced programming-language semantics | A Programmers Place
https://vanemden.wordpress.com/2014/06/18/how-recursion-got-into-programming-a-comedy-of-errors-3/