174 citations · 581 across the 5 of their papers we have counts for
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D. Koester, B. Voss, R. Napiwotzki +5
The ESO Supernova Ia Progenitor Survey (SPY) took high-resolution spectra of more than 1000 white dwarfs and pre-white dwarfs. About two thirds of the stars observed are hydrogen-d…