GOST 7.59-1990 System of standards on information, librarianship and publishing. Indexing of documents. General requirements for classifying and subject indexing
2003GOST 7.59-2003 System of standards on information, librarianship and publishing. Indexing of documents. General requirements for classifying and subject indexing
1990GOST 7.59-1990 System of standards on information, librarianship and publishing. Indexing of documents. General requirements for classifying and subject indexing