They are accused of kidnappings and murders in the Campo de Mayo military base, one of the largest torture centres in the country.
The hearings are taking place in an indoor football pitch to guarantee enough space for members of the public wishing to be present.
Al Jazeera's Teresa Bo reports.
Published by i On Global Trends - Mike Hitchen Online - news, opinion, analysis
See also Sydney Irresistible
Putting principles before profits
See also Sydney Irresistible
Putting principles before profits