I think you're referring to Victor Eijkhout's book(s): https://theartofhpc.com/ https://theartofhpc.com/ These are great references too! They actually popped i

I think you're referring to Victor Eijkhout's book(s): https://theartofhpc.com/ https://theartofhpc.com/ These are great references too! They actually popped into to my head only after I replied! Google search was struggling to find the page for me too, I had to look up the author by name.