The Charleston Advisor v. 1, no. The maximum number of stars in each category is 5. Bibliographic information covers a much longer time period than many databases, but older abstracts are only included in limited form and new citations are slow to appear. Solid functionality offered in novice and expert searching modes. The terms for multiple formats are fair, but US customers pay more than the exchange rate justifies on an already stiff list price.
Limited access is universally free.
This webbed version of the Zentralblatt fur Mathematik provides comprehensive indexing of the mathematics literature from 1931, when the print version began, to the present. Reviews and title translations may occur in English, French, or German, with English predominating in recent years. A few items are linked to their full-text online locations. The standard query form allows keyword or phrase searching in a variety of fields, with examples shown for author searches. The advanced search form has a similar design but enables more complicated combinations of fields.