References

• Albrecht M.A., Heck A., 1994, A&AS 103, 471 NASA ADS
• Heck A., 1991, Astronomical directories, in Databases & On-Line Data in astronomy, Albrecht M.A. & Egret D. (eds.). Kluwer Acad. Publ., Dordrecht, p. 211-224
• Heck A., 1995, A&AS 109, 265 (see also the URL: http://vizier.u-strasbg.fr/starheads.html)
• Heck A., 1997a, StarGuides 1997 - A directory of astronomy, space sciences and related organizations of the world, Publ. Spéc. CDS 29, viii + pp. 1022 (ISBN 2-908064-27-8)
• Heck A., 1997b, Electronic yellow-page services: The Star*s Family as an example of diversified publishing, in Electronic Publishing for Physics and Astronomy, Heck A. (ed.). Kluwer Acad. Publ., Dordrecht, p. 221-220 (see also the URL: http://vizier.u-strasbg.fr/starpages.html)
• Heck A., Ciarlo A., Stokke H., 1992, A&AS 96, 565-566 NASA ADS
• Heck A., Egret D., Ochsenbein F., 1994, A&AS 108, 447-448 (see also the URLs: http://vizier.u-strasbg.fr/starworlds.html and http://vizier.u-strasbg.fr/starbits.html)
• Stroobant P., Delvosal J., Philippot H., Delporte E., Merlin E., 1907, Les observatoires astronomiques et les astronomes, Hayez, Bruxelles, p. 318