A low cost positioning and visualization system using smartphones for emergency ambulance service. - Alexandre Bellini; Carlos E. Cirilo; Vinícius Ramos Toledo Ferraz; Josué G. Araujo; Juliana Lilian Duque; Luana Peixoto Annibal; Rafael Serapilha Durelli; Cesar Marcondes (SEHC@ICSE, 2010)