3.2.3.1.5 External Name Formulas
External name formulas are restricted to cell references within the same external book.
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external-name-formula= ["="], external-name-expression ; external-name-expression= same-book-prefix, A1-reference | external-name-error-constant ; same-book-prefix= same-book-single-sheet, "!" | same-book-sheet-range, "!" ; same-book-single-sheet= sheet-name | apostrophe, sheet-name-special, apostrophe ; same-book-sheet-range= sheet-name, ":", sheet-name | apostrophe, sheet-name-special, ":", sheet-name-special, apostrophe ; external-name-error-constant= "#REF!" ;