Supported Heterogeneous Silica Sulphuric Acid: Reusable Catalysts for Synthesis of Barbituric Acid Based Knoevenagel Adducts. J. Int. Acad. Phys. Sci. [Internet]. 2020 Sep. 15 [cited 2026 Oct. 23];24(3):347-59. Available from: http://www.iaps.org.in/journal/index.php/journaliaps/article/view/32