Audio-visual conference through the ionosphere at 4 kbps. - Antonio Navarro 002; Joao Angeja; João Tavares 004; Rui Rodrigues; Luis Carvalho; Fernando Perdigao (ICME, 2004)

Multi-conference over HF packet radio channels. - Antonio Navarro 002; Rui Rodrigues; Joao Angeja; João Tavares 004; Luis Carvalho; Fernando Perdigao (ICME, 2004)

Error analysis of MPEG-4 HVXC parameters at high frequencies. - Fernando Perdigao; Rui Rodrigues; Antonio Navarro 002 (ICME, 2004)