[Sorry for the previous message. Not sure what my email client did.]
What I originally wanted to write:
Thanks for that interesting tool! I tried and got https://tools.wmflabs.org/citationhunt/en?id=3712ed79 Then I found two books from 2014 and 2018 which include entire sections of that English Wikipedia article without citation. So this might be a future case of "no reference in Wikipedia -> Wikipedia content is copied into a book or article -> someone adds that book or article as a reference to Wikipedia -> it must be true!"
Worrisome, but of course not the fault of this useful tool. :)
andre