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#libro de #fรญsica: "An Introduction to the Relativistic Theory of Gravitation", por Petr Hรกjรญฤek. https://t.co/APYJyxzqeV https://t.co/pc5VTlFEZJ
#libro de #fรญsica: "An Introduction to the Relativistic Theory of Gravitation", por Petr Hรกjรญฤek. https://t.co/APYJyxzqeV https://t.co/pc5VTlFEZJ