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Moerbeek, M., Breukelen, G.J.P.V., Berger, M.P. (2008). Optimal Designs for Multilevel Studies. In: Leeuw, J.d., Meijer, E. (eds) Handbook of Multilevel Analysis. Springer, New York, NY. https://doi.org/10.1007/978-0-387-73186-5_4
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