How many movies have Michael Stehr and Uli Aselmann collaborated on?

They have worked on 4 movies together! Their first movie together was Deathline (1996) while their highest rated movie together was Die Musterknaben (1997). They have not worked together since Die Musterknaben 3 - 1000 und eine Nacht (2003). They are most known for their crime films together.