in the most recent period. USA is the top producing country, followed by the United Kingdom, Australia. freance, Germany, Spain, and Canada. There were 17,493 authors contributing to the field. During 19912006 there were 4098 organizations with authors involved in…
Fecha:
20130312T14:38:56Z, 20130312T14:38:56Z, 2008
Recurso:
Facultad de Ciencias - UNAM
CIC - Centro de Información y Conocimiento Johannes Gutenberg ®