Defaru Negera, and Teketel Yohannes. “Hansen Solubility Parameters and Green Solvents for Organic Photovoltaics”. International Journal of Advances in Scientific Research and Engineering (IJASRE), ISSN:2454-8006, DOI: 10.31695/IJASRE 4, no. 10 (October 5, 2018): 119–128. Accessed December 19, 2024. https://ijasre.net/index.php/ijasre/article/view/735.