تعامد (رياضيات) (Arabic Wikipedia)

Analysis of information sources in references of the Wikipedia article "تعامد (رياضيات)" in Arabic language version.

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archive.org

  • J.A. Wheeler؛ C. Misner؛ K.S. Thorne (1973). Gravitation. W.H. Freeman & Co. ص. 58. ISBN:0-7167-0344-0.

books.google.com

web.archive.org