Universal Digital Classification, PDF file (in Russian, 651 Kb)
"Universal Digital Classification
(UDC) is a basis for systematization
of human store knowledge in libraries, data bases and other informational
stores. UDC is accepted to categorize documents in the majority of
countires in the world. UDC is an obligatory component in Russia
of all publishing production and information on natural and technical
MSC 2010 —
Mathematics Subject Classification
Subject Classification (MSC) is used to categorize items covered
by the two reviewing databases,
Mathematical Reviews (MR) and Zentralblatt MATH (Zbl).
The MSC is broken down into over 5,000 two-, three-, and five-digit
classfications, each corresponding to a discipline of mathematics.
The current 2010 Mathematics Subject Classification (MSC2010) is a
revision of the MSC2000 that has been used by MR and Zbl since 2000.
Physics and Astronomy Classification Scheme®
The Physics and Astronomy Classification Scheme® (PACS®)
is prepared by the American Institute of Physics (AIP)
in collaboration with certain other members of the International
Council on Scientific and Technical Information (ICSTI).
PACS is a hierarchical subject classification scheme designed to classify and categorize the literature of physics and astronomy.
PACS provides an essential tool for classification and efficient retrieval of literature in physics
and astronomy; as such, PACS is used by AIP and other international publishers of journals in physics, astronomy, and related fields.