Olaf has the full story here.
The cliff notes version is that Frey et. al basically published the same paper 4 times in different journals without any of the 4 referencing or making note of the existence of the others.
Further, there are multiple previous papers that use the same data, similar techniques and draw similar conclusions. None of them are cited in any of the Frey et. al papers.
The econ job rumors site has a huge thread on the Frey affair as well.