A mobile application and system architecture for online speech training in portuguese: design, development, and evaluation of SofiaFala - Macedo, Alessandra Alaniz; Gonçalves, Vinícius de Souza; Mandrá, Patrícia Pupin; Motti, Vivian Genaro; Bulcão Neto, Renato de Freitas; Rodrigues, Kamila Rios da Hora (Multimedia Tools and Applications, 2025)