Input (grade 13): Paul Hockenhos, Joschka Fischer and the Making of the Berlin Republic, Oxford University Press, 2007, p 86 He studied the works of Marx, Mao and Hegel and became a member of the militant group Revolutionärer Kampf (Revolutionary Struggle).
Output (grade 10): He studied the works of Marx, Mao and Hegel and became a member of the militant group Revolutionary Combat ().