Esterification of oleic acid to biodiesel using biowaste‐based solid acid catalyst under microwave irradiation. - Kushwaha, Tribhuvan; Ao, Supongsenla; Ngaosuwan, Kanokwan; Assabumrungrat, Suttichai; Gurunathan, Baskar; Rokhum, Samuel Lalthazuala (Environmental Progress & Sustainable Energy, 2023)