Virgilio Almeida Wagner Meira Jr. Victor F. Ribeiro Nivio Ziviani A Quantitative Analysis of the User Behavior of a Large E-Broker. 38-45 1999 WECWIS http://computer.org/proceedings/wecwis/0334/03340038abs.htm db/conf/wecwis/wecwis1999.html#AlmeidaMRZ99