FIRMENICH, SERGIO, GUSTAVO ROSSI, MATIAS URBIETA, CECILIA CHALLIOL, JOCELYNE NANARD, MARC NANARD, and JOAO ARAUJO. 2010. “ENGINEERING CONCERN-SENSITIVE NAVIGATION STRUCTURES. CONCEPTS, TOOLS AND EXAMPLES”. Journal of Web Engineering 9 (2):157-85. https://journals.riverpublishers.com/index.php/JWE/article/view/4023.