METZING, D.; KIESLING, R.; MEREGALI, M. Typification of Gymnocalycium quehlianum (Cactaceae). Hickenia, [S. l.], v. 3, p. (3): 9–11, 1999. Disponível em: https://www.hickenia.darwin.edu.ar/index.php/hickenia/article/view/10. Acesso em: 25 abr. 2024.