Seeking author

[Allena]

Donbass, speaking about the quality of work, you must necessarily take into account the place of its creation. I agree that the level is not outstanding (by the way, I really liked the thing, though she did not understand what), but there is nothing said.
Most likely, you have to find better not go to art, and in the paper path: write queries in the archives of the Berlin Academy, in the archives, which houses the camp documentation (especially since you know the name of the camp). You refer to the witnesses, therefore, alive people who were there with him. Do you have the opportunity once again to speak to them? Sometimes, seemingly forever forgotten names pop up in memory of the conversation in unexpected ways. By the way, you know what happened to him after 1949? Perhaps, he managed to escape and return to Germany, and perhaps in the academy.
In short, if the work is no hint of the signature, then the path you have one - inquiries and conversations, the work itself to its author is unlikely.