VIVICH, E. “Kill time productively”: The transformation of crossword puzzles after Perestroika. Shagi, [S. l.], v. 5, n. 4, p. 239–259, 2019. DOI: 10.22394/2412-9410-2019-5-4-239-259. Disponível em: https://shagi.owebs.ru/article/view/9376. Acesso em: 8 nov. 2026.