Natasa Milic-Frayling Rachel Jones Kerry Rodden Gavin Smyth Alan F. Blackwell Ralph Sommerer Smartback: supporting users in back navigation. 63-71 2004 conf/www/2004 WWW http://doi.acm.org/10.1145/988672.988682 db/conf/www/www2004.html#Milic-FraylingJRSBS04