Ahmed, T. W., T. H. Usmani, M. T. Motan, and M. A. Damani. “?DELIGNIFICATION OF KENAF (HIBISCUS SABDARIFFA) BY ORGANOSOLV PULPING PROCESS. PART-II. FORMIC AND PROPIONIC ACIDS”. Biological Sciences - PJSIR, vol. 43, no. 2, Apr. 2000, pp. 103-7, https://v2.pjsir.org/index.php/biological-sciences/article/view/2005.