Context: It should be noted that Estonian words and names quoted in international publications from Soviet sources are often back-transliterations from the Russian transliteration. Examples are the use of "ya" for "ä" (e.g. Pyarnu instead of Pärnu), "y" instead of "õ" (e.g., Pylva instead of Põlva) and "yu" instead of "ü" (e.g., Pyussi instead of Püssi). 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).

Question: In Soviet international publications what language's transliteration are Estonian words and names often back-transliterations from?
Answer: Russian

Question: What famous encyclopedia contains a Russian back-transliteration of Estonian?
Answer: Encyclopædia Britannica

Question: What is the Russian back-transliteration from Encyclopædia Britannica?
Answer: "ostrov Khiuma"

Question: What famous encyclopedia contains a Estonian back-transliteration of Russian?
Answer: Unanswerable

Question: What is the Estonian back-transliteration from Encyclopædia Britannica?
Answer: Unanswerable

Question: What is the Estonian translation of ostrov?
Answer: Unanswerable

Question: What is the Estonian translation of Khiuma?
Answer: Unanswerable