Mirabell, the list is helpful. But as with so many literatures, we must try to identify specific authors and books, otherwise it remains a good idea. The Djuric book is this one about which your original quote was about is:
Rajko Djuric
Die Literatur der Roma und Sinti
Edition Parabolis, Berlin 2002, 208 S
If it has 208 pages, it sounds substantial. And it's quite new. That would be a good starting point. I'm sure we can find collections of poetry, maybe the odd novel, but it will require a little research. I've not found the Parabolis website, yet. But here's the Amazon entry:
http://www.amazon.de/Literatur-Roma-Sinti-Rajko-Djuric/dp/3884023071