@misc{Kaul2016,
author = {Kaul, A. and Klößner, S. and Pfeifer, G. and Schieler, M.},
title= {Synthetic control methods: Never use all pre-intervention outcomes as economic predictors [unpublished]},
year = {2016},
URL = {http://www.oekonometrie.uni-saarland.de/papers/SCM_Predictors.pdf},
}