The NASA Astrophysics Data System: OverviewMichael J. Kurtz, Guenther Eichhorn, Alberto Accomazzi, Carolyn S. Grant, Stephen S. Murray and Joyce M. WatsonAstron. Astrophys. Suppl. Ser., 143 1 (2000) 41-59DOI: https://doi.org/10.1051/aas:2000170