search query: @author Ries, P. / total: 1
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| title | year | author | ||
| 1. |
Umwelt Wirtschafts Forum
1994 : APR, VOL. 1:2, p. 37-39 |
1994 | Ries, P. |
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| title | year | author | ||
| 1. |
Umwelt Wirtschafts Forum
1994 : APR, VOL. 1:2, p. 37-39 |
1994 | Ries, P. |