OJCEWICZ, Grzegorz. Kwadrat Zbigniewa Żakiewicza. Studia Rossica Gedanensia, [S. l.], p. 540–552, 2015. Disponível em: https://czasopisma.bg.ug.edu.pl/index.php/SRG/article/view/4484. Acesso em: 22 lip. 2024.