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2
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Information systems and organizational structure / ed. by Erwin Grochla and Norbert Szyperski.
- de Gruyter,
- 1975.
- Berlin [etc.] :
-
A survey of virulence genes in wheat stem rust, Puccinia graminis f. sp. tritici / Norbert H. Luig.
- Parey,
- 1983.
- Berlin [etc.] :