Search by URL source

While there is a filter for books, and it is possible to search for journals and publishers by title, there is currently (AFAIK) any way to search by URL. This would be very useful if, for instance, I wanted to find all my citations from in order to decide which Kindle ebook to download next. This would mean I could be free of depending on Amazon wishlists. Also useful for shopping for hardcover books, or for finding journals that are on a particular database available at my school.