File type identification is a symbol indicating various types of reference files. The description of references should comply with GB 77 14-87 "Rules for the Description of References after Articles" and "Data Specification for Retrieval and Evaluation of Academic Journals in China (CD-ROM Edition)". The author of the paper should use the following document type identification codes to indicate the types and carrier types of various references cited by himself.
Extended data
The type of electronic document carrier is identified by two letters, as follows:
(1) journal [J] (journal)
(2) Monograph [M]
(3) Paper collection [c]
(4) Paper [D]
(5) patent [P] (patent)
(6) Technical standards (standardization)
Newspapers (articles)
(8) Science and Technology Report [R] (Report)
The type of electronic document carrier is identified by two letters, as follows:
(1) magnetic tape [MT] (magnetic tape)
(2) Disk [DK] (Disk)
(3) CD
(4) Online network [OL] (online)
Baidu Encyclopedia-Document Type Recognition