1. 2016-10-19 [Bug 48703] sum spanning multiple worksheets poi-dev bugzilla 2. 2014-07-26 [Bug 48703] sum spanning multiple worksheets poi-dev bugzilla 3. 2014-07-03 [Bug 48703] sum spanning multiple worksheets poi-dev bugzilla 4. 2013-12-18 [Bug 48703] sum spanning multiple worksheets poi-dev bugzilla 5. 2012-12-20 [Bug 48703] sum spanning multiple worksheets poi-dev bugzilla 6. 2012-12-18 [Bug 48703] sum spanning multiple worksheets poi-dev bugzilla