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, p. 221-220, see also the URL: http://vizier.u-strasbg.fr/starpages.html
• 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, 403-406 NASA ADS
• Heck A., 1998c, Astronomy-related organizations over the world, A&AS 132, 65-81 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