“SILICA SUPPORTED PERCHLORIC ACID (HCLO4-SIO2) AS ECOFRIENDLY REUSABLE CATALYSTS FOR GREEN SYNTHESIS OF TETRAHYDROBENZO[B]PYRAN DERIVATIVES BY GRINDING METHOD”. 2022. International Journal of Food and Nutritional Sciences 11 (12): 3348-53. http://www.ijfans.org/index.php/Journal/article/view/13213.