All others are retrospective so that the year of the abstract is, at least, a year or two later than the year of the periodical article. The abstracts are in German. This is the major mathematics abstracting source published in Germany. It is in classified arrangement, with author and key indexes. Each tenth volume is a cumlative author index to the previous nine.
Abstracts are predominantly in English, some are in German or French.
It stresses coverage of eastern European, American and Japanese publications and sometimes has references to European publications not in Mathematical Reviews. The cumulated indexes are complicated to use. Zentralblatt MATH Database. Indexes literature from all science disciplines, covers about 5700 journals. The citation index indicates authors who have been cited in the current scientific literature.