not a great deal on Wikipedia, but for what it's worth: http://en.wikipedia.org/wiki/Graphic_notationalfor wrote:There should be a website (in English or German), explaining avantgarde notation symbols!?
Most if not all of the Grinblat notation seems much like the modern Polish school to me (as Klavierelch has written), so the scores to look at would be Penderecki's and Serocki's (whose names come immediately to mind, rather than Lutoslawski who never went to such extremes). Their music from the early to mid 1960s shows the extension of traditional notation toward graphic notation. It's supposed to be fairly intuitive, but often isn't!