Hussain, Khadim, Syed Muhammad Ahsan, Muhammad Shahbaz, and Tauqir Ahmed. 2011. “ONTOLOGY BASED INTELLIGENT WORK FLOW FOR TECHNICAL PRODUCT DEVELOPMENT IN CHEMICAL ENGINEERING”. Journal of the Pakistan Institute of Chemical Engineers 39 (1):47-50. http://piche.org.pk/journal/index.php/jpiche/article/view/42.