1
   
2
   
4
Published: Kabul, Afghanistik Verlag - Social Business Verlag, [2016]
   
16
Published: Kiel, Inst. für Informatik und Praktische Mathematik, 1994
   
17
Published: Kiel, Inst. für Informatik und Praktische Mathematik, 1994
   
19
Published: Ibadan, Daystar Press, 1969
   

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