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Author(s): Hagstotz, Werner; Krauth, Cornelia; Porst, Rolf.- 1982. 22p.
Author(s): Hauck, Ute; Trometer, Reiner.- 1988. 22,37,4p.
Author(s): Thögersen, John.- 2001. 55-74p.
Author(s): Eilinghoff, Carmen.- 1996. 161p.