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2
3
Published: 1978
Superior document: Forschungsberichte des Zentralinstituts für Wirtschaftswissenschaften der Akademie der Wissenschaften der DDR 29
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Published: [2022]
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5
Published: [2022]
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6
Published: 2015.
7
Published: [1978];, [1978]
Superior document: Title is part of eBook package: De Gruyter ABA Humanities - 1971 - 1990
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8
Published: [2022]
Superior document: Title is part of eBook package: De Gruyter DGBA Mathematics - <1990
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