2
   
3
Published: Witzenhausen, Selbstverl. d. Verbandes d. Tropenlandwirte Witzenhausen, 2001
   
7
Published: Frankfurt a.M, Peter Lang GmbH, Internationaler Verlag der Wissenschaften, 2014
   
9
Published: Brussels, Peter Lang AG, Internationaler Verlag der Wissenschaften, 2013
   
11
   
12
Published: Köln [u.a.], Heymanns, 1983
   
14
Published: Tübingen, Niemeyer, 2004
   
17
   
20
   

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