Apparently the mass graves were indeed a false quote I found, sorry about that. I was at times drawn into the discussion and started to look for some facts (especially on all the anti-revisionist web sites I was pointed to). But ultimately I ended up deciding that the subject is not important enough for me to invest the time. It would have to be a full time job, and I am not a historian.
I am sorry I mentioned the issue.
It sounds like you're sincere and just trying to find high quality of evidence, but statements to the effect that 'there are no mass graves' seem to contradict established fact.