2.1.1119 Part 4 Section 3.18.65, ST_RefA (Absolute Cell Reference)
a. The standard defines this subclause to be a reference to single cell.
Office allows elements or attributes of this type to be either a single cell reference or an area reference.
b. The standard does not describe the type of cell references that are allowed.
Office specifies the appropriate format of the cell references and the parsing format to be the same as ST_Ref.