A.D, Altalhi, and Sonya H.M. Hussein. “PARTIAL PROPERTIES OF PECTIN METHYLESTERASE EXTRACTED FROM STREPTOMYCETE ISOLATE ”. Pakistan Journal of Biotechnology, vol. 7, no. 1-2, Apr. 2021, pp. 45-50, https://pjbt.org/index.php/pjbt/article/view/299.