Atghia, S. V., & Beigbaghlou, S. S. (2013). Nanocrystalline titania-based sulfonic acid (TiO2-Pr-SO3H) as a new, highly efficient, and recyclable solid acid catalyst for preparation of quinoxaline derivatives. Journal of Nanostructure in Chemistry, 3(1 (December 2013). https://doi.org/10.1186/2193-8865-3-38