Informationsverarbe i tung B 137.767131 IV 

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aas e , V(olkmar). -Videotex and te1econtro1. 
By V. Haase, W(a1ter) Jaburek, I(stvan) 
3ebestyen. /Mit Abb./ -Graz: Techn. Univ. 

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schungsberichte.131.)