> Perhaps that debunking was in the very book > cited by Martin J. Dürst earlier in this thread. Yes, starting on page 24. https://books.google.com/books?id=hypplIDMd0IC&pg=PA24&dq=isbn:0824812077+Yukaghir&hl=en&sa=X&ved=0ahUKEwj1n4r719zgAhWJn4MKHcdyCHIQ6AEIKjAA#v=onepage&q=isbn%3A0824812077%20Yukaghir&f=false