Slavs:

The word "Slavs" was used in the national anthem of the Slovak Republic (1939–1945), Yugoslavia (1943–1992) and the Federal Republic of Yugoslavia (1992–2003), later Serbia and Montenegro (2003–2006).

Please answer a question about this article. If the question is unanswerable, say "unanswerable". When was slavs used for the Yugoslavia and Montenegro anthem?
unanswerable