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1كتاب
المؤلفون: Leibundgut, Bruno, Aschenbach, B., Burwitz, V., Hasinger, G., Leibundgut, B., Williger, G.M., Colbert, J., Teplitz, H.I., Francis, P.J., Palunas, P., Woodgate, B.E.
المصدر: Relativistic Astrophysics Legacy & Cosmology - Einstein's Legacy; 2008, p358-362, 5p