Metal traces in white dwarfs of the SPY (ESO Supernova Ia Progenitor Survey) sampleD. Koester, K. Rollenhagen, R. Napiwotzki, B. Voss, N. Christlieb, D. Homeier and D. ReimersA&A, 432 3 (2005) 1025-1032DOI: https://doi.org/10.1051/0004-6361:20041927
