“Supported Heterogeneous Silica Sulphuric Acid: Reusable Catalysts for Synthesis of Barbituric Acid Based Knoevenagel Adducts” (2020) Journal of International Academy of Physical Sciences, 24(3), pp. 347–359. Available at: http://www.iaps.org.in/journal/index.php/journaliaps/article/view/32 (Accessed: 23 October 2026).