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Herschel, William «On the Proper Motion of the Sun and Solar System; With an Account of Several Changes That Have Happened among the Fixed Stars since the Time of Mr. Flamstead.». Philosophical Transactions of the Royal Society of London, 73, 1783, pàg. 247–83. DOI: 10.1098/rstl.1783.0017. JSTOR: 106492.