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\section{Citing practices of Helsinki astronomers}  Looking at refereed papers published by Helsinki astronomers, their lists of references show which sources they are using. An easy way to harves references is through the Scopus bibliometric database, as it offers a particularly straigthforward metdod to save references for a large number of articles. To find the papers from Scopus one could search by affiliation, but Scopus does not differentiate astronomy papers from physics. Instead, DOIs for astronomy papers 2005-2013 were harvested from the University of Helsinki TUHAT database, in which all publications are attachedinto  a subject category.