Otávio Augusto Lazzarini Lemos Daniel Carnio Junqueira Marco Aurélio Graciotto Silva Renata Pontin de Mattos Fortes John W. Stamey Using aspect-oriented PHP to implement crosscutting concerns in a collaborative web system. 134-141 2006 conf/sigdoc/2006 SIGDOC http://doi.acm.org/10.1145/1166324.1166358 db/conf/sigdoc/sigdoc2006.html#LemosJSFS06