Ayyaz, Ahsan, et al. “Differential Responses of Exogenous Melatonin on Growth, Photosynthesis and Antioxidant Defence System in Two Brassica Napus L.Cultivars under Chromium Stress”. International Journal of Environment, Agriculture and Biotechnology, vol. 5, no. 2, Mar. 2020, https://journal-repository.com/index.php/ijeab/article/view/1855.