Buenos Aires: An Argentine former military chief has gone on trial for the disappearance of a left-wing couple during the country’s dictatorship.

The former chief of the air force, Omar Graffigna, 90, is accused with two other defendants of the forced disappearance of Jose Manuel Perez Rojo and Patricia Roisinblit in 1978.

His trial opened on Monday, with the court on the outskirts Buenos Aires hearing the charge list of accusations of crimes against humanity.

Perez and Roisinblit were allegedly kidnapped by air force personnel on October 6, 1978 and have never been found.

The victims’ families say Roisinblit gave birth in captivity and her child was stolen.

One of the two other defendants, former intelligence officer Francisco Gomez, was already convicted in 2005 of stealing Roisinblit’s child.

Roisinblit’s mother Rosa is one of the leaders of the Grandmothers of the Plaza de Mayo, a prominent campaign group for victims of the 1976-1983 dictatorship.

Campaigners say 30,000 people were victims of forced “disappearances.”

The former dictator Jorge Videla and other top members of the regime were sentenced to life in prison in 1985.