Year of the article can be one to two years prior to the year of the abstract. Abstracts are in German. This is the current, standard and most comprehensive abstracting and indexing service in the fields of astronomy and astrophysics, but because it is published as bound volumes only, the year of the article can be one to two years prior to the year of the abstract.
Abstracts are in English.
There are Author and Subject cumulated indexes . This reference work incorporates all astronomical literature from the earliest times through 1880, and contains information on unpublished manuscripts as well as books and periodical articles. A Bibliographic Guide. Abstracts material through 1968. It includes annotations and states number of citations in a particular article.