Ricardo A. Baeza-Yates Barbara Poblete Evolution of the Chilean Web Structure Composition. 11-13 2003 conf/la-web/2003 LA-WEB http://csdl.computer.org/comp/proceedings/la-web/2003/2058/00/20580011abs.htm db/conf/la-web/la-web2003.html#Baeza-YatesP03