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APA Citation
Knutsen, C. H., Teorell, J., Wig, T., Cornell, A., Gerring, J., Gjerløw, H., Skaaning, S., Ziblatt, D., Marquardt, K. L., Pemstein, D., & Seim, B. (2019). introducing the Historical Varieties of Democracy dataset: Political institutions in the long 19th century. Journal of peace research, 56, 440–451. http://access.bl.uk/ark:/81055/vdc_100083569607.0x00001e