Political imprisonment in the GDR : a survey of former political prisoners from the GDR about their imprisonment in the GDR, 1986 - Rothenbächer, Wulf; Vemmer, Wilfried; International Society for Human Rights German Section Arbeitsausschuss "Bürgerrechtsbewegung und Politische Gefangene der DDR." (International Society for Human Rights, German Section, "Committee on The Civil Rights Movement and Political Prisoners in the GDR", 1987)