Science

State Public Scientific and Technical Library of Russia.

Electronic Catalog GPNTB.

Search by keyword - phrase in natural language.
Keywords are formed from almost all fields of bibliographic description.
The phrase is broken down into individual words (numbers are not counted!), Which morphologically normalize (only for Russian words!).
When searching by keywords, the algorithm for ranking the found documents is used: the list of search results is sorted in descending order of the document's rank.

The more words are found in the found document from the query, the closer these words are to each other and the greater their total weight is, the higher is the place of the document as a result of the search.

The "Find Similar" link, which is shown in the bibliographic description of the records found, generates a request for a ranked search that includes all the keywords of the record.

Having received the search result, you will be able to "refine" your query in the same way (search in the found one).