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function z.sfn(frame)
local pframe = frame:getParent()
pframe.args.Postscript = pframe.args.postscript or pframe.args.ps or "."; local content = crossref(frame, 'FOOTNOTECITEREF', pframe.args)
local args = { name = refid( 'FOOTNOTE', pframe.args) }
return createTag({name = "ref", contents = content, params = args}, frame)