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Arpino, Bruno and Mealli, Fabrizia (2008): The specification of the propensity score in multilevel observational studies.
Arpino, Bruno and Varriale, Roberta (2009): Assessing the quality of institutions’ rankings obtained through multilevel linear regression models.
Arpino, Bruno and Mattei, Alessandra (2013): Assessing the Impact of Financial Aids to Firms: Causal Inference in the presence of Interference.
