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- [42] THE FLUX AND SPECTRAL VARIABILITY OF NGC6814 AS OBSERVED WITH EXOSAT ACTIVE GALACTIC NUCLEI /, 1989, 134 : 179 - 181
- [44] Warm winds in the Seyfert 1 galaxy NGC 5548 RECYCLING INTERGALACTIC AND INTERSTELLAR MATTER, 2004, (217): : 356 - 357