Is there a service/app/site that offers recommendations on other books based on the citations that are found in a book you liked?<p>I've started noticing that the books I have read and liked tend to mention authors of other books that I've read and liked. Tversky and Kahnemann come up in a lot of books as an example, I like to read non-fiction mostly. So that lead to new books by the two authors that I've enjoyed.<p>That got me thinking that you can possibly apply a type of pageRank algorithm to citations or toss the connections in a graph database and see the number of relationships between books (popularity based on citations) and work your way backwards from the books you liked to new books that are connected.<p>Wondering if you've ever come across something like that that you can recommend?