INSPIRE-HEP, an open access digital library for the field of high energy physics developed by Stanford University, has been the main literature database for universities, colleges, and research institutions since when?
INSPIRE-HEP: INSPIRE-HEP is an open access digital library for the field of high energy physics (HEP). Stanford Physics Information Retrieval System: The Stanford Physics Information Retrieval System (SPIRES) is a database management system developed by Stanford University. Stanford Physics Information Retrieval System:  It is used by universities, colleges and research institutions.
i don't know