  Wikipedia articles about the same topic in different language editions are
built around different sources of information. For example, one can find very
different news articles linked as references in the English Wikipedia article
titled "Annexation of Crimea by the Russian Federation" than in its German
counterpart (determined via Wikipedia's language links). Some of this
difference can of course be attributed to the different language proficiencies
of readers and editors in separate language editions, yet, although including
English-language news sources seems to be no issue in the German edition,
English references that are listed do not overlap highly with the ones in the
article's English version. Such patterns could be an indicator of bias towards
certain national contexts when referencing facts and statements in Wikipedia.
However, determining for each reference which national context it can be traced
back to, and comparing the link distributions to each other is infeasible for
casual readers or scientists with non-technical backgrounds. Wikiwhere answers
the question where Web references stem from by analyzing and visualizing the
geographic location of external reference links that are included in a given
Wikipedia article. Instead of relying solely on the IP location of a given URL
our machine learning models consider several features.
