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WikiPedia: Howard P. Robertson http://calteches.library.caltech.edu/216/1/thesumm... http://findingaids.library.caltech.edu/14/01/Paper... http://adsabs.harvard.edu/abs/1913LowOB...2...56S http://adsabs.harvard.edu/abs/1915PA.....23...21S http://adsabs.harvard.edu/abs/1927TrAMS..29..481R http://adsabs.harvard.edu/abs/1929PNAS...15..822R http://adsabs.harvard.edu/abs/1929PhRv...34..163R http://adsabs.harvard.edu/abs/1934PhRv...46..794R http://adsabs.harvard.edu/abs/1937MNRAS..97..423R http://adsabs.harvard.edu/abs/2006PhT....59h..36R