“SILICA SUPPORTED PERCHLORIC ACID (HCLO4-SIO2) AS ECOFRIENDLY REUSABLE CATALYSTS FOR GREEN SYNTHESIS OF TETRAHYDROBENZO[B]PYRAN DERIVATIVES BY GRINDING METHOD”. International Journal of Food and Nutritional Sciences, vol. 11, no. 12, Jan. 2022, pp. 3348-53, http://www.ijfans.org/index.php/Journal/article/view/13213.