Kipper, A. (1934). Variation of surface gravity upon two Cepheids - δ Cephei and η Aquilae.
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Citação norma Chicago
Kipper, A. Variation of Surface Gravity upon Two Cepheids - δ Cephei and η Aquilae. Tartu, 1934.
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Citação norma MLA
Kipper, A. Variation of Surface Gravity upon Two Cepheids - δ Cephei and η Aquilae. 1934.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.