Integer multiplication in time O(n log n) [pdf]
I'm making my way through uni currently. I've taken a few CS classes that have touched briefly on O notation and I am currently in Calc 2. I understand bits and pieces of this but I am lost in most of the paper. What courses should I be taking to better my understanding of papers of this sort? Or alternatively, are there any online resources that could help me work my way through research papers like these?