zbMATH Open (formerly known as Zentralblatt MATH) is the world's most comprehensive and longest-running abstracting and reviewing service in pure and applied mathematics. zbMATH Open contains around 4.2 million bibliographic entries with reviews or abstracts drawn from more than 3,000 journals and book series, and some 190,000 books. Its coverage, which starts in the 18th century, is complete from 1868 to the present day, due to the integration of the "Jahrbuch über die Fortschritte der Mathematik" database. The database contains more than one million profiles of identified authors connected with various platforms, the database of mathematical software swMATH, about 35 million references, and connections to various full text platforms or Q&A forums like MathOverflow.
Open resource. Contact Bill Jacobs with any problems.