CiNii

CiNii () is a bibliographic database service for things in Japanese academic libraries. The database started in April 2005 and is maintained by the National Institute of Informatics. The service searches from the NII databases [NII Electronic Library Service (NII-ELS) and Citation Database for Japanese Publications (CJP)], and the databases from the National Diet Library of Japan, institutional repositories, and other organizations.
The database has more than 15 million articles from more than 3,600 publications. 
Database identifiers.
The database gives a unique identifier, "NII Article ID" (NAID), to each of the journal articles in its list. A different identifier, "NII Citation ID" (NCID or 書誌ID) or "NACSIS-CAT Record ID", is used for books.