Spectral analyses of eighteen hot H-deficient (pre-) white dwarfs from the Sloan Digital Sky Survey Data Release 4S. D. Hügelmeyer, S. Dreizler, D. Homeier, J. Krzesiński, K. Werner, A. Nitta and S. J. KleinmanA&A, 454 2 (2006) 617-624DOI: https://doi.org/10.1051/0004-6361:20064869
