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| 1978 | ||
|---|---|---|
| 1 | Helmut Frommknecht, Ernst Wirkner: The development level of the system of information and documentation on social sciences in the GDR in 1977. Inf. Process. Manage. 14(3-4): 227-233 (1978) | |
| 1 | Ernst Wirkner | [1] |
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