Something new. (I'm not stalking to tear down your product, but just because I really love it!!).
I've got a lot of scientific papers. These papers often do have a last chapter "Recommended further readings" And yes, with ISBN.
In this case there are 3 options:
1. ISBN of document is not available
2. ISBN of document is on first page(s)
3. ISBN is at the end of document (after further readings)
(I've not seen ISBN before further readings.)
Is it possible to change the behavior in look at first x pages top down
Look at last x pages bottom up?
Or would this decrease speed a lot?