I want to know the answer to the following question:
What famous encyclopedia contains a Russian back-transliteration of Estonian?
All the background I'm provided with is that "Even in the Encyclopædia Britannica one can find "ostrov Khiuma", where "ostrov" means "island" in Russian and "Khiuma" is back-transliteration from Russian instead of "Hiiumaa" (Hiiumaa > Хийума(а) > Khiuma).". Is that enough to answer the question?