The sentence was handed down yesterday by a Buenos Aires court that found the four guilty of "illegal deprivation of liberty, torture, rape and homicide" involving 204 people held at a secret detention centre known as the Vesubio.
The four are former colonels Federico Minicucci and Jorge Crespi, former intelligence officer Gustavo Cacivio, and former colonel and prison official Nestor Cendon.
Among their victims were two French nationals -- Francoise Dauthier and Juan Soler -- and a German, Elisabeth Kasemann, all of whom disappeared in 1977.
Soler, a former priest and construction worker, was abducted from his home with his Argentine mother.
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Kasemann, a 30-year-old sociologist and daughter of a Lutheran theologian, was kidnapped in May and her bullet-riddled body was found two months later along with those of 15 other people.
About 2,500 people were detained at the Vesubio detention center between 1976 and 1978, when it was destroyed ahead of a visit by a delegation from the Inter-American Commission on Human Rights.