PUPPEL, Stanisław. An assessment of natural language robustness and how it relates to natural language sustainability: a fuzzy ecological approach to the lives of natural languages. Studia Rossica Posnaniensia, [S. l.], n. 38, p. 223–230, 2013. DOI: 10.14746/strp.2013.38.17. Disponível em: https://pressto.amu.edu.pl/index.php/strp/article/view/354. Acesso em: 21 lis. 2024.