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              Volkens A, Bara J, Budge I, et al. (2013) Mapping Policy Pre- ferences from Texts III: Statistical Solutions for Manifesto Analysts. Oxford: Oxford University Press.
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              Volkens, A., Bara, J., Budge, I., McDonald, M. D. & Klingemann, H.-D. (2013). Mapping policy preferences from texts: Statistical solutions for manifesto analysts (Vol. 3). Oxford University Press.
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              Volkens, Andrea et al., eds. (2013). Mapping Policy Preferences from Texts. Statistical Solutions for Manifesto Analysts. Oxford University Press.
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              Volkens, A., Bara, J., Budge, I., McDonald, M. D., Klingemann, H. D. (2013). Mapping Policy Pre- ferences from Texts III: Statistical Solutions for Manifesto Analysts. Oxford: Oxford University Press. 3.
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