Proof of Buchdal's Theorem | Show & Send Link

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Can anyone show me a proof of this theorem? Could someone possibly send me a link?
 
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http://prola.aps.org/abstract/PR/v116/i4/p1027_1
General Relativistic Fluid Spheres
H. A. Buchdahl
Phys. Rev. 116, 1027 - 1034 (1959)
 

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