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@book{galilei1957discoveries,  title={Discoveries and Opinions of Galileo: Including The Starry Messenger (1610), Letter to the Grand Duchess Christina (1615), and Excerpts from Letters on Sunspots (1613), The Assayer (1623)},  author={Galilei, G.}, author={Drake, S.},  isbn={9780385092395},  lccn={90030691},  series={Anchor books},