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Eva Isaksson deleted file Citing practices of Helsinki astronomers.tex
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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 harvest references is through the Scopus bibliometric database, as it offers a particularly straigthforward tool for saving references for a large number of articles. To find the papers from Scopus, DOIs for astronomy papers 2005-2013 were harvested from the University of Helsinki TUHAT database limiting the search to refereed papers in the "Astronomy, Space Physics" category.
The 17,849 references found in Scopus had to be inspected to determine whether the authors had access to the sources they had cited. Identifying this many references was the hard part. Most references to astronomy journal references were quite clear, but as the authors often used non-standard abbreviations, many source titles needed to be identified and standardized. For each journal reference, it was determined whether University of Helsinki had e-access, print access or no access to the source title and volume at the time when the referencing paper was published. For journals, this process was fairly easy, but for books, each title had to be looked up separately in the University of Helsinki HELKA catalog.
Not surprisingly, 87\% of all references were to journals. The access to journals was quite good: 93\% of cited journal articles were available online and 6\% in print. Only one percent of journal references was unavailable at Helsinki. It is of course possible that that these were available to the article coauthors in another library. The results showed a steady number of references, with a sudden, steady growth of the number of references starting in 2010. However, the access percentages did not vary much from 2005 to 2013, which probably means that the Helsinki astronomers had access to relevant journal titles both before and after the institutional merger.
The second largest source type were books -- 4\% of all references. It was impossible to detect whether e-books had been used, but as these were not very accessible until about 2013, e-book access was not checked as it was probably not significant. The library had 70\% of the titles in print form while 30\% of the titles were not available. In Figure 2, the number of titles are shown for each publication year. The form of the graph is similar to the current book collection, which could mean that the current (even if reduced) book collection has been enough to meet the needs of astronomers fairly well.
A survey was sent to Helsinki astronomers in June 2014 to check whether they agreed with the results. The question was: "How often did you use a prnted journal in 2010-2014?" 91\% of the respondents said they never use printed journals anymore. The journals that were still read in print form were predominantly popular astronomy or general science magazines -- something one reads during a coffee break.
