MASKEY-BYANJU, R.; GEWALI, M. B.; MANANDHAR, K. Low cost passive monitoring of sulphur dioxide in ambient air: An effort from developing world. Nepal Journal of Environmental Science, [S. l.], v. 1, n. 1, p. 21–26, 2013. DOI: 10.3126/njes.v1i1.36544. Disponível em: https://www.nepjol.info/index.php/njes/article/view/36544. Acesso em: 17 oct. 2021.