Ehsan A, Ahsan AH, Mannan A, Iqbal MZ. ?DEVELOPMENT OF CATALYST FROM NATURAL CLAYS FOR FRIEDEL CRAFTS ALKY- LATION AND NEW SYNTHESIS OF 9,10 DIHYDROANTHRACENE. Pakistan Journal of Scientific & Industrial Research [Internet]. 1999 Jun. 21 [cited 2024 Nov. 22];42(3):156-60. Available from: http://v2.pjsir.org/index.php/biological-sciences/article/view/2141