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Joos, Siegfried Schmidt-
found: Brigl, K. Fritz Rau ... c1985: t.p. (Siegfried Schmidt-Joos)
found: LC data base, 5-30-86 (hdg.: Schmidt-Joos, Siegfried)
found: Rock-Lexikon, 1998: prelim. p., Die Autoren (b. Apr. 17, 1936 in Gotha, Thüringia)