In a reference, the pages of an article or analogous subdocument in which a publication resides. Specified as a sequence of two integers.
(=> (Ref.Pages ?Ref ?Page-Range)
(And (Or (Book-Section-Reference ?Ref)
(Article-Reference ?Ref)
(Proceedings-Paper-Reference ?Ref))
(Integer (First ?Page-Range))
(Integer (First (Rest ?Page-Range)))))