google scholar search would likely rank articles based on relevance. this should reveal the top articles/ authors. the top articles are normally a good way in.
or perhaps you are fortunate enough to have someone suggest it to you.
As suggested by Brian Barnard, Google Scholar is an excellent tool to find articles that address your queries. It is more efficient than Google. You have several questions rolled into one. I have some references for your investor awareness hypothesis item. Here:
Article What Drives the S&P 500 Inclusion Effect? An Analytical Survey