Hier ein paar Studien zur "Vielfalt"
https://osf.io/u94jy/
https://www.ncbi.nlm.nih.gov/pubmed/24913947
https://onlinelibrary.wiley.com/doi/abs/10.1111/juaf.12015
https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1465-7287.2010.00215.x
http://journals.sagepub.com/doi/abs/10.1177/0190272515612403
https://academic.oup.com/esr/article-abstract/21/4/311/556895
https://www.researchgate.net/publication/300799700_The_Geography_of_Ethnic_Violence
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0095660
https://academic.oup.com/esr/article/32/1/54/2404332
https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1467-9477.2012.00289.x
https://academic.oup.com/sf/article-abstract/93/3/1211/2332107?redirectedFrom=fulltext
https://www.npr.org/templates/story/story.php?storyId=12802663
http://archive.is/xFWbh
http://file.scirp.org/Html/7-1670124_48450.htm
http://qje.oxfordjournals.org/content/115/3/847.abstract