On Scholarly Publishing: Making Sense of SJR and SNIP

SCImago Journal Rank (SJR) is a prestige metric based on the idea that 'all citations are not created equal'.

Source-Normalized Impact per Paper (SNIP) measures the impact of a paper within a subject field. Impact Per Publication (IPP) is the average number of citations received in a particular year by papers published in the journal during the three preceding years.