According to two German historians who have been studying the Van Gogh, and in particular the oft-told tale that he cut off his own ear, are now claiming that in fact fellow artist Paul Gauguin may have been the one wielding the sword. Read the story here.
The Art & Architecture Library has a lot of books and other materials regarding these two artists...here's just a few:
Van Gogh and Gauguin: Electric Arguments and Utopian Dreams by Bradley Collins
Van Gogh and Gauguin : the Search for Sacred Art by Debora Silverman