Hm, it was Kjell Flekkøy who investigated and I found some documents from a web search on his name. I would guess the Swedish society for parapsychology covered it as well, Flekkøy could very well have visited.

What about the poltergeist phenomena at the kindergarden in Vågå, Norway? The report from the parapsychologist who investigated used to be in the municipal public post journal. One of my favorites!