Xuan Nui, P., N. Quang Man, P. Tuan Dat, N. Van Thoai, P. Tien Dung, and T. Thi Van Thi. “Preparation of MCM-41 Supported WO3 Catalyst and Its Performance in Oxidative Desulfurisation”. Petrovietnam Journal, Vol. 2, Feb. 2017, pp. 40 -46, doi:10.25073/petrovietnam journal.v2i0.126.