1. Arul, P., & Kranthi, K. (2012). Web Page Categorization based on Document Structure. Centre for Visual Information Technology. International Institute of Information Technology. Gachibowli. Hyderabad, India. General format. Retrieved October 17, 2013, from http://www.cs.utah.edu/~arul/paper.pdf
2. The anatomy of a large-scale hypertextual Web search engine
3. Cabrera Hungría, M. R. (2009). Aspectos semánticos de la integración de fuentes de datos. UCLM (Universidad de Castilla. La Mancha). Escuela Superior de Informática. General format. Retrieved Februry 10, 2014, from http://alarcos.inf-cr.uclm.es/doc/cmsi/trabajos/Rosa%20Cabrera.pdf
4. Automatic hierarchical clustering of web pages.;R.Campos;Proceedings of ELECTRA’05. Workshop Methodologies and Evaluation of Lexical Cohesion Techniques in Real-world Applications. Associated to the 28th Annual International ACM, SIGIR Conference,2005