>>12152341At least 1. When doing research, you don't really need to read one in its entirety but to get references or further snippets in other books, Reading one is a good headstart, but actually reading at least 4-6 books for research purposes is the pre-requisite.
Longest bibliography I ever had was 12 books.But in the case of Mumei - it won't matter much, especially if Omega is always in the close surroundings and catches you red handed...
