Personal Comment: I cannot give you any sources on that. But you don't need that. This is basically just a way to reveal a chosen card. I like the premise. It's cute.
Years ago I visited a local magic circle in Berlin, Germany. They had their own little magazine. And Jochen Zmeck, being an honorary member of that circle, contributed to that magazine. The pamphlets are called "ZauBerlin" but that is pretty much all I can say about that.