Cu-Doped chicken eggshells: An eco-friendly catalyst for the production of green biodiesel with Azadirachta indica seed oil to promote the circular economy. Indian Journal of Chemical Technology (IJCT), [S. l.], v. 32, n. 5, p. 623–631, 2025. DOI: 10.56042/ijct.v32i5.14789. Disponível em: https://or.niscpr.res.in/index.php/IJCT/article/view/14789. Acesso em: 14 may. 2026.