За миллиард лет до конца света

Definitely Maybe (Russian: За миллиард лет до конца света, romanized: Za milliard let do kontsa sveta, literal translation: A Billion Years Before the End of the World, sometimes called Definitely Maybe: A Manuscript Discovered Under Unusual Circumstances) is a science fiction novel by Russian writers Arkady and Boris Strugatsky, first published 1974.