search query: @author Helfrecht, Manfred / total: 3
references: 2-3 / 3
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title | year | author | ||
2. |
Methodik
1997 : 1, p. 2-4 |
1997 | Helfrecht, Manfred |
|
3. |
Methodik
1994 : 2, p. 77-79 |
1994 | Helfrecht, Manfred |
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