Abdou H, Léopold EN, Malloum MSA, Bitom D. Assessment of Heavy Metal Contamination Levels in Market Gardening Soils Used to Grow Onions (Allium Cepa) in the City of Abéché (Eastern Chad). Int J Appl Sci Biotechnol [Internet]. 2023 Mar. 31 [cited 2024 Nov. 21];11(1):42-53. Available from: https://nepjol.info/index.php/IJASBT/article/view/53700