References

• Heck A., 1997, 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, (see also the URL: http://vizier.u-strasbg.fr/starpages.html) p. 211-220
• Heck A., 1998a, StarGuides 1998 - A directory of astronomy, space sciences and related organizations of the world, Publ. Spéc. CDS 30, viii + 1068 pp. (ISBN 2-908064-28-6)
• Heck A., 1998b, Geographical distribution of observational activities in astronomy, A&AS 130, 403 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)