Class size reduction works

I have repeatedly heard that studies show class size reduction is not effective. Where are these studies? When were they done? I am willing to guess standards were not as high when these studies occurred. I currently have twenty students in my classroom and I feel I hardly have enough time to meet all of their personal needs. My district has decided to get rid of class size reduction next year. This means that I will have 32 students in my kindergarten class next year instead of twenty. I feel I won't be as effective of a teacher with this many students in my classroom. There has got to be a better way to deal with the budget cuts. I think that it is the students who will hurt from this decision. Does anyone know of any studies that proves class size reduction is effective?