I'm using Peter Auer as my starting point, and I've had Schlobinski and Beiswenger recommended to me, but I found out much too late that their books literally don't exist in my country. I'm desperately trying to find similar sources, preferably in German, but I've had zero luck so far.
So, could anyone recommend me some (relatively easy to find) books, essays, etc. on the subject?
Thanks in advance!