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Published
R.N.Bitar and Khalil A.Wishah
AlQuds Open University
  
Published
Mousa M. Abdul- Gader and Khalil A.Wisah
Al- Quds Open University
  
Published
Isa Shahin , Yousef Mahmud and K. Wishah
  
Published
Khalil A.Wishah
  
Published
Khalil A.Wishah
  
Published
Khalil A.Wishah
  
Published
Khalil A.Wishah