http://www.cnn.com/2000/TECH/computing/02/09/denial.of.service/
http://news.cnet.com/news/0-1007-200-1545348.html?tag=st.ne.1002.
http://www.digito.pt/tecnologia/noticias/tec1988.html
http://dot.gil.di.uminho.pt/articles/1000208/100237.shtml