Title	Digital Library of Online PDF Sources: An ETL Approach
Author	Gohar Zaman, Hairulnizam Mahdin, Khalid Hussain, Atta-ur-Rahman, Nehad Ibrahim, and Noor Zuraidin Mohd Safar
Citation	Vol. 20  No. 11  pp. 172-181
Keywords	Ontology, Digital Library, ETL, SQL, RDF, OFIE, FRBS

Title	Exploration in Algorithm Engineering: Modeling Algorithms
Author	Sabah Al-Fedaghi
Citation	Vol. 20  No. 11  pp. 159-171
Keywords	Algorithm, conceptual model, diagrammatic representation, Turing machine, finite state machine

Title	Detecting Spammers in Social Networks
Author	Eman A. Altameem and Mehmet Sabih Aksoy
Citation	Vol. 20  No. 11  pp. 153-158
Keywords	Online Social Networks, Spam Detection, Machine Learning, Twitter.

Title	Enhancing security of Urdu language websites through Urdu CAPTCHA
Author	Imtiaz Ahmed Dahar, Fizza Abbas Alvi, and Ubaidullah Rajput
Citation	Vol. 20  No. 11  pp. 142-152
Keywords	Urdu, CAPTCHA, security, efficiency.