Production of biodiesel from waste cooking oil utilizing zinc oxide nanoparticles combined with tungsto phosphoric acid as a catalyst and its performance on a CI engine - Jayaraman, Jayaprabakar; Dawn, S.S.; Appavu, Prabhu; Mariadhas, Anish; Joy, Nivin; Alshgari, Razan A.; Karami, Abdulnasser Mahmoud; Huong, Pham Thi; Rajasimmam, M.; Kumar, J. Aravind (Fuel, 2022)