Seasonal Variations of certain Physico-chemical Parameters in the Valapattanam River of Kannur district, Kerala. Journal of Indian Association for Environmental Management (JIAEM), [S. l.], v. 41, n. 2, p. 29–35, 2023. Disponível em: https://or.niscpr.res.in/index.php/JIAEM/article/view/1067. Acesso em: 14 may. 2026.