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Lua MLA (8ú heag.)Klymyshyn, Ivan Antonovych, agus V. S. Imshennik. Rel︠i︡ativistska︠i︡a Astronomi︠i︡a. 2. izd., perer. i dop. "Nauka," Glav. red. fiziko-matematicheskoĭ lit-ry, 1989.
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