1. Vesanto, Aleksi, Filip Ginter, Hannu Salmi, Asko Nivala, Reetta Sippola, Heli Rantala, and Petri Paju. Text Reuse in Finnish Newspapers and Journals, 1771–1920, http://comhis.fi/clusters.
2. National Library of Finland Digital Newspaper Collection. https://digi.kansalliskirjasto.fi/.