Held, A. (1980). General relativity and gravitation: One hundred years after the birth of Albert Einstein. New York: Plenum Press.
Παραπομπή Chicago StyleHeld, A. General Relativity and Gravitation: One Hundred Years After the Birth of Albert Einstein. New York: Plenum Press, 1980.
Παραπομπή MLAHeld, A. General Relativity and Gravitation: One Hundred Years After the Birth of Albert Einstein. New York: Plenum Press, 1980.
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