DOI:
10.1055/s-00000022
Das Gesundheitswesen
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References
Lechner M.
The Estimation of Causal Effects by Difference-in-Difference Methods.
Discussion paper No. 2010-282011. Universität St. Gallen (Oktober 2011). Im Internet
http://www1.vwa.unisg.ch/RePEc/usg/dp2010/DP-1028-Le.pdf Stand:15.08.2013
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