<cell ref="this_cell"/><cell ref="that_cell"><cell ref="that_cell">
</row>
<row>
- <formula>=<ref ref="this_cell">+<ref ref="that_cell"></formula>
+ <formula>=<backref ref="this_cell">+<backref ref="that_cell"></formula>
</row>
The formula in row 2 would be =A1+C1. C1 is the last to reference "that_cell".