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Cernat, Alexandru (2015) Evaluating mode differences in longitudinal data. Moving to a mixed mode paradigm of survey methodology. PhD thesis, University of Essex.
Cernat, Alexandru (2015) Impact of mixed modes on measurement errors and estimates of change in panel data. Survey research methods, 9 (2). pp. 83-99. DOI https://doi.org/10.18148/srm/2015.v9i2.5851
Cernat, Alexandru and Nedelcu, Anca and Colibaba, Stefan and Rus, Calin and Popovici, Ruxandra (2012) Romania. In: Language Rich Europe: Trends in Policies and Practices for Multilingualism in Europe. Cambridge University Press, Cambridge, pp. 187-194. Official URL: https://www.iser.essex.ac.uk/publication/521145