Hello! The number of ISI Webofknowledge before revision is the retrieval number of SCI, WOS is the retrieval number of SCI periodical papers after ISI revision, and the retrieval number of selected articles of some conferences in the WOS core database. At present, SCI retrieval is only for periodicals, not conference articles. Therefore, although some conference papers have WOS retrieval numbers, they are not SCI databases, but Webofknowledge's own core databases. Generally, SCI journals will have id numbers.