Higher relevance for local language and English
At Swedish universities, both English and Swedish is used, but not really other language (unless, of course, you study that language). I guess this situation is quite common in several countries - items in English + in the local language are welcome, but items in other languages should be ranked lower.
Example: If we search for "Manuel Castells", our books in Swedish by this author are ranked much lower than, for instance, articles in Spanish about the author.
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