I think I can find it in the following source:
Geisler, H., 1973: Ein Adelsgrab auf dem germanischen Urnengräbergeld bei Kemnitz, Kr. Potsdam-Land, Zeitschrift für Archäologie 7, 279-298.So, of course, I've ordered it from the library.
I'm really curious to see how it looks, to find out how it was done. I certainly hope that there are pictures of this thing.
Yeah, these are the kind of things that excite me.