Can we get more information on what counts for this market? Because there can be a lot of vague cases. What if there is a book about genus Leopardus with a dedicated chapter on L. tilcayo? What if it's one of those academic books which is a loose collection of chapters that are published separately and you can buy a PDF of any chapter without the rest of the book? What if there is a book on genus Leopardus with information on L. tilcayo scattered throughout? Should it be a proper book (with ISBN, say), or does a self-published PDF that looks kinda like a book also count?