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              Raudenbush S, Bryk AS, Cheong YF, Conger R: HLM 6: Hierarchical Linear and Nonlinear Modeling Chicago: Scientific software international 2004.
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              Raudenbush S. W. et al. (2004). HLM 6: Hierarchical Linear and Nonlinear Modeling. Lincolnwood, IL: Scientific Software International.
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              Raudenbush, S. W., Bryk, A. S., Cheong, Y. F., & Congdon, R. (2004). HLM 6: Hierarchical linear and nonlinear modeling. Chicago: Scientifi c Software International.
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              Raudenbush, S. W., Bryk, T., & Congdon, R. (2004). HLM 6 hierarchical linear and nonlinear modeling (computer program). Lincolnwood, IL: Scientifi c Software International, Inc. Riketta, M. (2005). Cognitive differentiation between self, ingroup, and outgroup: The roles of identifi cation and perceived intergroup confl ict. European Journal of Social Psychology, 35, 97-106.
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              Raudenbush, S., Bryk, A., Cheong, Y. F, Congdon, R., and du Toit, M. (2004). HLM 6: Hierarchical Linear and Nonlinear Modeling. Lincolnwood: Scientific Software International.
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              Raudenbush, S.W. / A.S. Bryk / Y.F. Cheong / R. Congdon, 2004: HLM 6 -Hierarchical Linear and Nonlinear Modeling. Lincolnwood: Scientific Software International.
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              Raudenbush, S., ., Cheong, Y. F., Congdon, R., Toit, M. (2004). HLM 6 hierarchical linear and nonlinear modeling (computer program. Lincolnwood, IL: Scientifi c Software International, Inc. European Journal of Social Psychology, 35 pp. 97-106.
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