Supplemental information format (e.g. [S1], [S2])

Hi everyone,
I need to create a bibliography for a Supplementary Materials section, in which the reference have to be labeled "S1","S2" (rather than 1,2,3..)both in the text and the bibliography. Any simple way to edit a given style (where shall I add "S" into the .cls code)? Any easier way?
Thank a lot for your help. Best!
Ervan
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