J. Hall A, A. Mohammad H. Measurement of Quantitative Colour Values of Ore Minerals Using a Filter-Photocell Method. INJES [Internet]. 2012 Apr. 1 [cited 2025 Nov. 4];12(1):23-38. Available from: https://berj.uomosul.edu.iq/index.php/injes/article/view/40889