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Journal Article (18)
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1.Journal ArticlePhysical association and periodicity in quasar families with SDSS and 2MRS. Astrophysics and Space Science 363 (7), 134 (2018)
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2.Journal ArticleThe 2dF redshift survey - I. Physical association and periodicity in quasar families. The Astrophysical Journal 754 (2), 134, pp. 1 - 10 (2012)
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3.Journal ArticleQuasars associated with NGC 613, NGC 936 and NGC 941. Astrophysics and Space Science 301 (1-4), pp. 117 - 126 (2006)
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4.Journal ArticleA QSO discovered at the redshift of the extended X-ray cluster RX J0152.7-1357. Publications of the Astronomical Society of the Pacific 118 (839), pp. 124 - 128 (2006)
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5.Journal ArticleThe long search for black holes. Science 309 (5732), p. 245 - 245 (2005)
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6.Journal ArticleThe discovery of a high-redshift X-ray-emitting QSO very close to the nucleus of NGC 7319. Astrophysical Journal 620 (1), pp. 88 - 94 (2005)
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7.Journal ArticleObservational cosmology: from high redshift galaxies to the blue pacific. Progress in Physics 3, pp. 1 - 6 (2005)
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8.Journal ArticleA galaxy cluster near NGC 720. http://de.arxiv.org/ (2005)
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9.Journal ArticleX-ray bright QSO's around NGC 3079. http://de.arxiv.org/ (2005)
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10.Journal ArticlePeriodicities of quasar redshifts in large area surveys. http://de.arxiv.org/ (2005)
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11.Journal ArticleQSOs and active galactic nuclei associated with NGC 2639. The Astrophysical Journal - Supplement Series 153 (1), pp. 159 - 164 (2004)
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12.Journal ArticleNew optical spectra and general discussion on the nature of ULXs. Astronomy & Astrophysics 418 (3), pp. 877 - 833 (2004)
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13.Journal ArticleThe double radio source 3C 343.1: A galaxy-QSO pair with very different redshifts. Astronomy & Astrophysics 414 (3), pp. L37 - L40 (2004)
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14.Journal ArticleQSOs associated with M82. The Astrophysical Journal 591 (2), pp. 690 - 694 (2003)
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15.Journal ArticleThe nature of the ultraluminous X-ray Sources inside galaxies and their relation to local QSOs. Astronomy & Astrophysics 400 (3), pp. L17 - L19 (2003)
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16.Journal ArticleArguments for a Hubble constant near H-0=55. The Astrophysical Journal 571 (2), pp. 615 - 618 (2002)
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17.Journal ArticleNGC 3628: Ejection activity associated with quasars. Astronomy & Astrophysics 391 (3), pp. 833 - 840 (2002)
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18.Journal ArticleDynamics of ejection from galaxies and the variable mass hypothesis. International Journal of Modern Physics D 11 (2), pp. 245 - 257 (2002)
Book (1)
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19.BookCatalogue of discordant redshift associations. C Roy Keys Inc, Montreal (2003), 234 pp.
Book Chapter (6)
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20.Book ChapterQuasars in the life of astronomers. In: Fifty Years of Quasars: From Early Observations and Ideas to Future Research, pp. 11 - 90 (Eds. D'Onofrio, M.; Marziani, P.; Sulentic, J. W.). Springer, Heidelberg [u.a.] (2012)