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@xrefThe @xref command generates a cross reference for the
beginning of a sentence.  The Info formatting commands convert it into
an Info cross reference, which the Info f command can use to
bring you directly to another node.  The TeX typesetting commands
convert it into a page reference, or a reference to another book or
manual.
@xref with one argument. 
@xref with two arguments. 
@xref with three arguments. 
@xref with four and five arguments.