HOSSAIN, M. A. Application Of The Seifert-Van Kampen Theorem To Certain Sums Of Topological Spaces. Journal of Bangladesh Academy of Sciences, [S. l.], v. 35, n. 2, p. 197–201, 2012. DOI: 10.3329/jbas.v35i2.9424. Disponível em: https://banglajol.info/index.php/JBAS/article/view/9424. Acesso em: 18 jul. 2024.