The Bibliographical Star Index (B.S.I.) ries to solve the problem of retrieving the observations or any kind of notes about a star. This file was initiated by Prof. R. Cayrel in 1964 and is going on through a collaboration between Paris-Meudon Observatories and the Stellar Data Center (see Ochsenbein and Spite, 1977). In pratice, the astrophysical papers published on stars are read, the names of all the stars cited in each paper are recorded; simultaneously, the complete bibliographical reference is recorded : name of the author(s), journal, volume, page, year of publication and the full title. These data are keypunched and stored in the computer, each star name is then tested, frequently replaced by a more used designation, and entered into the B.S.I. The retrieval program than lists all the papers with authors, references and full title in which a given star is cited.