“Effect of Chromium on Growth of Green ALGA SCENEDESMUS QUADR ICAUDA (TURP.) DE BERB. With Increase of Nitrogen Concentration”. Baghdad Science Journal 7, no. 2 (June 6, 2010): 910–917. Accessed December 23, 2024. https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/1057.