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  1. 1
    by Backes, Peter
    Published 1971
    Germany : Universität zu Köln, 1971.
    123 p.
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  2. 2
    by Backes, Peter
    Published 1995
    Germany : Universität zu Köln, 1995.
    IV, 170 S : graph. Darst., Kt.
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